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Math::MPC

Module Version: 1.01
Math::MPC - perl interface to the MPC (multi precision complex) library.

This module needs the MPC, MPFR and GMP C libraries. (Install GMP first, followed by MPFR, followed by MPC.) The GMP library is availble from http://gmplib.org The MPFR library is available from http://www.mpfr.org/ The MPC library is available from http://www.multiprecision.org/mpc/

A multiple precision complex number module utilising the MPC library. Basically, this module simply wraps the 'mpc' complex number functions provided by that library. Operator overloading is also available. The following documentation heavily plagiarises the mpc documentation. use warnings; use Math::MPC qw(:mpc); Rmpc_set_default_prec(500); # Set default precision to 500 bits my $mpc1 = Math::MPC->new(12.5, 1125); # 12.5 + 1125*i $mpc2 = sqrt($mpc1); print "Square root of $mpc1 is $mpc2\n"; See also the Math::MPC test suite for some (simplistic) examples of usage.

A complex rounding mode is of the form MPC_RNDxy where "x" and "y" are one of "N" (to nearest), "Z" (towards zero), "U" (towards plus infinity), "D" (towards minus infinity). The first letter refers to the rounding mode for the real part, and the second one for the imaginary part. For example MPC_RNDZU indicates to round the real part towards zero, and the imaginary part towards plus infinity. The default rounding mode is MPC_RNDNN, but this can be changed using the Rmpc_set_default_rounding_mode() function.

Objects can be created with the Rmpc_init2 and Rmpc_init3 functions, which return an object that has been blessed into the package Math::MPC. Alternatively, blessed objects can also be created by calling the new() function (either as a function or as a method). These objects will be automatically cleaned up by the DESTROY() function whenever they go out of scope. Rmpc_init2_nobless and Rmpc_init3_nobless are the same as Rmpc_init2 and Rmpc_init3, except that they return an unblessed object. If you create Math::MPC objects using the '_nobless' versions, it will then be up to you to clean up the memory associated with these objects by calling Rmpc_clear($op) for each object. Alternatively such objects will be cleaned up when the script ends. I don't know why you would want to create unblessed objects. The point is that you can if you want to.

Some of the Math::MPC functions below take Math::MPFR, Math::GMP, Math::GMPz, Math::GMPq, or Math::GMPf objects as arguments. Obviously, to make use of these functions, you'll need to have loaded the appropriate module.

Most of the following functions are simply wrappers around an mpc function of the same name. eg. Rmpc_neg() is a wrapper around mpc_neg(). "$rop", "$op1", "$op2", etc. are Math::MPC objects - the return value of one of the Rmpc_init* functions. They are in fact references to mpc structures. The "$op" variables are the operands and "$rop" is the variable that stores the result of the operation. Generally, $rop, $op1, $op2, etc. can be the same perl variable referencing the same mpc structure, though often they will be distinct perl variables referencing distinct mpc structures. Eg something like Rmpc_add($r1, $r1, $r1, $rnd), where $r1 *is* the same reference to the same mpc structure, would add $r1 to itself and store the result in $r1. Alternatively, you could (courtesy of operator overloading) simply code it as $r1 += $r1. Otoh, Rmpc_add($r1, $r2, $r3, $rnd), where each of the arguments is a different reference to a different mpc structure would add $r2 to $r3 and store the result in $r1. Alternatively it could be coded as $r1 = $r2 + $r3. In the documentation that follows: "$ui" means an integer that will fit into a C 'unsigned long int', "$si" means an integer that will fit into a C 'signed long int'. "$uj" means an integer that will fit into a C 'uintmax_t'. Don't use the _uj functions unless your perl was compiled with 64 bit integer support. "$sj" means an integer that will fit into a C 'intmax_t'. Don't use the _sj functions unless your perl was compiled with 64 bit integer support. "$double" is a C double. "$ld" is a C long double. Don't use the _ld functions unless your perl was compiled with long double support. "$bool" means a value (usually a 'signed long int') in which the only interest is whether it evaluates as false or true. "$str" simply means a string of symbols that represent a number, eg '1234567890987654321234567@7' which might be a base 10 number, or 'zsa34760sdfgq123r5@11' which would have to represent at least a base 36 number (because "z" is a valid digit only in bases 36 and above). Valid bases for MPC numbers are 2 to 36 (inclusive). "$rnd" is simply one of the 16 rounding mode values (discussed above). "$p" is the (unsigned long) value for precision. "$mpf" is a Math::GMPf object (floating point). You'll need Math::GMPf installed in order to create $mpf. "$mpq" is a Math::GMPq object (rational). You'll need Nath::GMPq installed in order to create $mpq. "$mpz" is a Math::GMP or Math::GMPz object (integer). You'll need Math::GMPz or Math::GMP installed in order to create $mpz. "$mpfr" is a Math::MPFR object (floating point). You'll need to 'use Math::MPFR;' in order to create $mpfr. (Math::MPFR a pre-requisite module for Math::MPC.) "$cc" is a Math::Complex_C (double _Complex) object. You'll need to 'use Math::Complex_C' (or create your own double _Complex object) in order to create $cc, and to use the functions that take such an argument. (Math::Complex_C is *not* a pre-requisite module for Math::MPC.) "$lcc" is a Math::Complex_C::Long (long double _Complex) object. You'll need to 'use Math::Complex_C' (or create your own long double _Complex object in order to create $lcc, and to use the functions that take such an argument. ###################### FUNCTION RETURN VALUES Most MPC functions have a return value ($si) which is used to indicate the position of the rounded real or imaginary parts with respect to the exact (infinite precision) values. The functions RMPC_INEX_RE($si) and RMPC_INEX_IM($si) return 0 if the corresponding rounded value is exact, a negative value if the rounded value is less than the exact one, and a positive value if it is greater than the exact one. However, some functions do not completely fulfill this - in some cases the sign is not guaranteed, and in some cases a non-zero value is returned although the result is exact. In these cases the function documentation explains the exact meaning of the return value. However, the return value never wrongly indicates an exact computation. ########################### MANIPULATING ROUNDING MODES Rmpc_set_default_rounding_mode($rnd); Sets the default rounding mode to $rnd. The default rounding mode is to nearest initially (MPC_RNDNN). The default rounding mode is the rounding mode that is used in overloaded operations. $ui = Rmpc_get_default_rounding_mode(); Returns the numeric value of the current default rounding mode. This will initially be 0 (MPC_RNDNN). ########## INITIALIZATION Normally, a variable should be initialized once only or at least be cleared, using `Rmpc_clear', between initializations - but don't explicitly call Rmpc_clear() on blessed objects. 'DESTROY' (which calls 'Rmpc_clear') is automatically called on blessed objects whenever they go out of scope. First read the section 'MEMORY MANAGEMENT' (above). Rmpc_set_default_prec($p); Rmpc_set_default_prec2($p_re, $p_im); Rmpc_set_default_prec sets the default precision to exactly $p bits for both the real and imaginary parts. Rmpc_set_default_prec sets the default precision to be *exactly* $p_re bits for the real part, and *exactly* $p_im bits for the imaginary part. The precision of a variable means the number of bits used to store its mantissa. All subsequent calls to `new' will use this precision, but previously initialized variables are unaffected. This is also the precision that will be used during some overloaded operations (see OPERATOR OVERLOADING below). The default precision is set to 53 bits initially (for both real and imaginary components). $ui = Rmpc_get_default_prec(); ($ui_re, $ui_im) = Rmpc_get_default_prec2(); Rmpc_get_default_prec returns the current default real precision iff the default real precision is the same as the current default imaginary precision. Otherwise it returns zero. Rmpc_get_default_prec2 returns both current default real precision and current default imaginary precision (in bits). $ui = Rmpc_get_prec($op); If the real and imaginary part of $op have the same precision, it is returned. Otherwise 0 is returned. $ui = Rmpc_get_re_prec($op); $ui = Rmpc_get_im_prec($op) ($re_prec, $im_prec) = Rmpc_get_prec2($op); Get (respectively) the precision of the real part of $op, the precision of the imaginary part of $op, or an array containing precision of both real and imaginary parts of $op. $rop = Math::MPC->new(); $rop = Math::MPC::new(); $rop = new Math::MPC(); Initialize $rop, and set its real and imaginary parts to NaN. The precision of $rop is the default precision, which can be changed by a call to `Rmpc_set_default_prec' or `Rmpc_set_default_prec2' (documented above). $rop = Rmpc_init2($p); $rop = Rmpc_init2_nobless($p); Initialize $rop, set the precision (of both real and imaginary parts) to be *exactly* $p bits, and set its real and imaginary parts to NaN. $rop = Rmpc_init3($p_re, $p_im); $rop = Rmpc_init3_nobless($p_r, $p_i); Initialize $rop, set the precision of the real part to be *exactly* $p_re bits, set the precision of the imaginary part to be *exactly* $p_im bits, and set its real and imaginary parts to NaN. Rmpc_set_prec($op, $p); Reset the precision of $op to be exactly $p bits, and set its real/imaginary parts to NaN. Rmpc_set_re_prec($op, $p); Rmpc_set_im_prec($op, $p); Set (respectively) the precision of the real part of $op to be exactly $p bits and the precision of the imaginary part of $op to be exactly $p bits. In both cases the value is set to NaN. (There are currently no corresponding MPC library functions.) ########## ASSIGNMENT $si = Rmpc_set($rop, $op, $rnd); $si = Rmpc_set_ui($rop, $ui, $rnd); $si2 = Rmpc_set_si($rop, $si1, $rnd); $si = Rmpc_set_d($rop, $double, $rnd); $si = Rmpc_set_uj($rop, $uj, $rnd); $si = Rmpc_set_sj($rop, $sj, $rnd); $si = Rmpc_set_ld($rop, $ld, $rnd); $si = Rmpc_set_f($rop, $mpf, $rnd); $si = Rmpc_set_q($rop, $mpq, $rnd); $si = Rmpc_set_z($rop, $mpz, $rnd); $si = Rmpc_set_fr($rop, $mpfr, $rnd); $si = Rmpc_set_dc($rop, $cc, $rnd); $si = Rmpc_set_ldc($rop, $lcc, $rnd); Set the value of $rop from 2nd arg, rounded to the precision of $rop towards the given direction $rnd. Don't use Rmpc_set_ld unless perl has been built with long double support. Don't use Rmpc_set_uj or Rmpc_set_sj unless perl has been built with long long int support. For Rmpc_set_dc and Rmpc_set_ldc, an mpc library (version 0.9 or later) that has been built with support for these data types is needed. $si = Rmpc_set_str($rop, $string, $base, $rnd); $si = Rmpc_strtoc($rop, $string, $base, $rnd); Set $rop to the value represented in $string (in base $base), rounded in accordance with $rnd. See the mpc documentation for details. $si = Rmpc_set_ui_ui($rop, $ui1, $ui2, $rnd); $si3 = Rmpc_set_si_si($rop, $si1, $si2, $rnd); $si = Rmpc_set_d_d($rop, $double1, $double2, $rnd); $si = Rmpc_set_f_f($rop, $mpf1, $mpf2, $rnd); $si = Rmpc_set_q_q($rop, $mpq1, $mpq2, $rnd); $si = Rmpc_set_z_z($rop, $mpz1, $mpz2, $rnd); $si = Rmpc_set_fr_fr($rop, $mpfr1, $mpfr2, $rnd); Sets the real part of $rop from 2nd arg, and the imaginary part of $rop from 3rd arg, according to the rounding mode $rnd. $si = Rmpc_set_uj_uj($rop, $uj1, $uj2, $rnd); $si = Rmpc_set_sj_sj($rop, $sj1, $sj2, $rnd); $si = Rmpc_set_ld_ld($rop, $ld1, $ld2, $rnd); Don't use the first 2 functions unless Math::MPC::_has_longlong() returns a true value. Don't use the 3rd function unless Math::MPC::_has_longdouble() returns true. Sets the real part of $rop from 2nd arg, and the imaginary part of $rop from 3rd arg, according to the rounding mode $rnd. $si = Rmpc_set_x_y($rop, $op1, $op2, $rnd); You need to replace the 'x' and the 'y' with any one of 'ui', 'si', 'd', 'uj', 'sj', 'ld', 'f', 'q', 'z' and 'fr' - eg: Rmpc_set_ui_d($rop, $ui, $double, $rnd); Don't use the 'uj' or 'sj' variants if Math::MPC::_has_longlong() doesn't return a true value. And don't use the 'ld' variants if Math::MPC_haslongdouble() doesn't return a true value. Sets the real part of $rop from 2nd arg, and the imaginary part of $rop from 3rd arg, according to the rounding mode $rnd. ################################################ COMBINED INITIALIZATION AND ASSIGNMENT NOTE: Do NOT use these functions if $rop has already been initialised or created by calling new(). Instead use the Rmpc_set* functions in the section 'ASSIGNMENT' (above). First read the section 'MEMORY MANAGEMENT' (above). $rop = Math::MPC->new($arg1 [, $arg2]); $rop = Math::MPC::new($arg1 [, $arg2]); $rop = new Math::MPC($arg1, [, $arg2]); Returns a Math::MPC object whose real component has a value of $arg1, rounded in the default rounding direction, with default precision. If $arg2 is supplied, the imaginary component of the returned Math::MPC object is set to $arg2, rounded in the default rounding direction, with default precision. Otherwise the imaginary component of the returned Math::MPC object is set to zero. $arg1 & $arg2 can be either a number (signed integer, unsigned integer, signed fraction or unsigned fraction), a string that represents a numeric value, a Math::MPFR object, a Math::GMP object, a Math::GMPz object, a Math::GMPq object or a Math::GMPf object. If a string argument begins with "0b" or "0B", then the string is treated as a base 2 string. Elsif it begins with "0x" or "0X" it is treated as a base 16 string. Else it is treated as a base 10 string. ########## ARITHMETIC $si = Rmpc_add($rop, $op1, $op2, $rnd); $si = Rmpc_add_ui($rop, $op, $ui, $rnd); $si = Rmpc_add_fr($rop, $op, $mpfr, $rnd); Set $rop to 2nd arg + 3rd arg rounded in the direction $rnd. $si = Rmpc_sub($rop, $op1, $op2, $rnd); $si = Rmpc_sub_ui($rop, $op, $ui, $rnd); $si = Rmpc_ui_sub($rop, $ui, $op, $rnd); Set $rop to 2nd arg - 3rd arg rounded in the direction $rnd. $si = Rmpc_ui_ui_sub($rop, $ui_r, $ui_i, $op, $rnd); The real part of $rop is set to $ui_r minus the real part of $op (rounded in the direction $rnd) - and the imaginary part of $rop is set to $ui_r minus the imaginary part of $op (rounded in the direction $rnd) $si = Rmpc_mul($rop, $op1, $op2, $rnd); $si = Rmpc_mul_ui($rop, $op, $ui, $rnd); $si = Rmpc_mul_si($rop, $op, $si1, $rnd); $si = Rmpc_mul_sj($rop, $op, $sj, $rnd); # Math::MPC XSub $si = Rmpc_mul_d($rop, $op, $double, $rnd);# Math::MPC XSub $si = Rmpc_mul_ld($rop, $op, $ld, $rnd); # Math::MPC XSub $si = Rmpc_mul_fr($rop, $op, $mpfr, $rnd); Set $rop to 2nd arg * 3rd arg rounded in the direction $rnd. The 'sj'/'ld' versions are available only on perls built with '64 bit int'/'long double' support. $si = Rmpc_mul_i($rop, $op, $si1, $rnd); If $si1 >= 0 (non-negative), set $rop to $op times the imaginary unit i - else set $rop to $op times -i. $si = Rmpc_div($rop, $op1, $op2, $rnd); $si = Rmpc_div_ui($rop, $op, $ui, $rnd); $si = Rmpc_ui_div($rop, $ui, $op, $rnd); $si = Rmpc_div_d($rop, $op, $double, $rnd); # Math::MPC XSub $si = Rmpc_d_div($rop, $double, $op, $rnd); # Math::MPC XSub $si = Rmpc_div_sj($rop, $op, $sj, $rnd); # Math::MPC XSub $si = Rmpc_sj_div($rop, $sj, $op, $rnd); # Math::MPC XSub $si = Rmpc_div_ld($rop, $op, $ld, $rnd); # Math::MPC XSub $si = Rmpc_ld_div($rop, $ld, $op, $rnd); # Math::MPC XSub $si = Rmpc_div_fr($rop, $op, $mpfr, $rnd); Set $rop to 2nd arg / 3rd arg rounded in the direction $rnd. The 'sj'/'ld' versions are available only on perls built with '64 bit int'/'long double' support. $si = Rmpc_sqr($rop, $op, $rnd); Set $rop to the square of $op, rounded in direction $rnd. $si = Rmpc_sqrt($rop, $op, $rnd); Set $rop to the square root of the 2nd arg rounded in the direction $rnd. When the return value is 0, it means the result is exact. Else it's unknown whether the result is exact or not. $si = Rmpc_pow($rop, $op1, $op2, $rnd); $si = Rmpc_pow_d($rop, $op1, $double, $rnd); $si = Rmpc_pow_ld($rop, $op1, $ld, $rnd); $si2 = Rmpc_pow_si($rop, $op1, $si, $rnd); $si = Rmpc_pow_ui($rop, $op1, $ui, $rnd); $si = Rmpc_pow_z($rop, $op1, $mpz, $rnd); $si = Rmpc_pow_fr($rop, $op1, $mpfr, $rnd); Set $op to ($op1 ** 3rd arg) rounded in the direction $rnd. Rmpc_pow_ld is available only on perls that have "long double" support. $si = Rmpc_neg($rop, $op, $rnd); Set $rop to -$op rounded in the direction $rnd. Just changes the sign if $rop and $op are the same variable. $si = Rmpc_conj($rop, $op, $rnd); Set $rop to the conjugate of $op rounded in the direction $rnd. Just changes the sign of the imaginary part if $rop and $op are the same variable. $si = Rmpc_abs($mpfr, $op, $rnd); Set the floating-point number $mpfr to the absolute value of $op, rounded in the direction $rnd. Return 0 iff the result is exact. $si = Rmpc_norm($mpfr, $op, $rnd); Set the floating-point number $mpfr to the norm of $op (ie the square of its absolute value), rounded in the direction $rnd. Return 0 iff the result is exact. $si = Rmpc_mul_2exp($rop, $op, $ui, $rnd); $si = Rmpc_mul_2ui ($rop, $op, $ui, $rnd);#same as Rmpc_mul_2exp $si1 = Rmpc_mul_2si ($rop, $op, $si2, $rnd); Set $rop to $op times 2 raised to 3rd arg rounded according to $rnd. Just increases the exponents of the real and imaginary parts by value of 3rd arg when $rop and $op are identical. $si = Rmpc_div_2exp($rop, $op, $ui, $rnd); $si = Rmpc_div_2ui ($rop, $op, $ui, $rnd);#same as Rmpc_div_2exp $si1 = Rmpc_div_2si ($rop, $op, $si2, $rnd); Set $rop to $op divided by 2 raised to 3rd arg rounded according to $rnd. Just decreases the exponents of the real and imaginary parts by value of 3rd arg when $rop and $op are identical. Rmpc_swap($op1, $op2); Swap the values (and precisions) of op1 and op2 efficiently. ########## COMPARISON $si = Rmpc_cmp($op1, $op2); $si = Rmpc_cmp_si($op, $si1); Compare 1st and 2nd args. The return value $si can be decomposed into $x = RMPC_INEX_RE($si) and $y = RMPC_INEX_IM($si), such that $x is positive if the real part of the 1st arg is greater than that of the 2nd arg, zero if both real parts are equal, and negative if the real part of the 1st arg is less than that of the 2nd arg. Likewise for $y. Both 1st and 2nd args are considered to their full own precision, which may differ. It is not allowed that one of the operands has a NaN (Not-a-Number) part. The storage of the return value is such that equality can be simply checked with Rmpc_cmp($first_arg, $second_arg) == 0. $si = Rmpc_cmp_si_si($op, $si1, $si2); As for the above comparison functions - except that $op is being compared with $si1 + ($si2 * i). ####### SPECIAL $si = Rmpc_exp($rop, $op, $rnd); Set $rop to the exponential of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_log($rop, $op, $rnd); Set $rop to the log of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_log10($rop, $op, $rnd); Set $rop to the base 10 log of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_arg ($mpfr, $op, $rnd); Set $mpfr to the argument of $op, with a branch cut along the negative real axis. ($mpfr is a Math::MPFR object.) $si = Rmpc_proj ($rop, $op, $rnd); Compute a projection of $op onto the Riemann sphere. Set $rop to $op, rounded in the direction $rnd, except when at least one part of $op is infinite (even if the other part is a NaN) in which case the real part of $rop is set to plus infinity and its imaginary part to a signed zero with the same sign as the imaginary part of $op. Rmpc_set_nan($op); Set $op to 'NaN +I*NaN'. ########## TRIGONOMETRIC $si = Rmpc_sin($rop, $op, $rnd); Set $rop to the sine of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_cos($rop, $op, $rnd); Set $rop to the cosine of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_sin_cos($r_sin, $r_cos, $op, $rnd_sin, $rnd_cos); Needs version 0.9 or later of the mpc C library. Set $r_sin/$r_cos to the sin/cos of $op, rounded according to $rnd_sin/$rnd_cos. (If the mpc C library is pre version 0.9, calling this function will cause the program to die with an appropriate error message.) $si = Rmpc_tan($rop, $op, $rnd); Set $rop to the tangent of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_sinh($rop, $op, $rnd); Set $rop to the hyperbolic sine of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_cosh($rop, $op, $rnd); Set $rop to the hyperbolic cosine of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_tanh($rop, $op, $rnd); Set $rop to the hyperbolic tangent of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_asin ($rop, $op, $rnd); Set $rop to the inverse sine of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_acos ($rop, $op, $rnd); Set $rop to the inverse cosine of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_atan ($rop, $op, $rnd); Set $rop to the inverse tangent of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_asinh ($rop, $op, $rnd); Set $rop to the inverse hyperbolic sine of $op, rounded according to $rnd with the precision of $rop. $si = Rmpc_acosh ($rop, $op, $rnd); Set $rop to the inverse hyperbolic cosine of $op, rounded according to$rnd with the precision of $rop. $si = Rmpc_atanh ($rop, $op, $rnd); Set $rop to the inverse hyperbolic tangent of $op, rounded according to$rnd with the precision of $rop. ########## CONVERSION ($real, $im) = c_string($op, $base, $digits, $rnd); $real = r_string($op, $base, $digits, $rnd); $im = i_string($op, $base, $digits, $rnd); $real is a string containing the value of the real part of $op. $im is a string containing the value of the imaginary part of $op. $real and $im will be of the form XeY (X@Y for bases greater than 10) - where X is the mantissa (in base $base) and Y is the exponent (in base 10). For example, -31.4132' would be returned as -3.14132e1. $digits is the number of digits that will be written in the mantissa. If $digits is zero, the mantissa will contain the maximum number of digits accurately representable. The mantissa will be rounded in the direction specified by $rnd. @vals = Rmpc_deref4($op, $base, $digits, $rnd); @vals contains (in order) the real mantissa, the real exponent, the imaginary mantissa, and the imaginary exponent of $op.The mantissas, expressed in base $base and rounded according to $rnd), contain an implicit radix point to the left of the first (ie leftmost) digit. The exponents are always expressed in base 10. $digits is the number of digits that will be written in the mantissa. If $digits is zero the mantissa will contain the maximum number of digits accurately representable. RMPC_RE($mpfr, $op); RMPC_IM($mpfr, $op); Set $mpfr to the value of the real (respectively imaginary) component of $op. $mpfr will be an exact copy of the real/imaginary component of op - ie the precision of $mpfr will be set to the precision of the real/imaginary component of $op before the copy is made. Hence no need for a rounding arg to be supplied. $si = Rmpc_real($mpfr, $op, $rnd); $si = Rmpc_imag($mpfr, $op, $rnd); Set $mpfr to the value of the real (respectively imaginary) part of $op, rounded in the direction $rnd. ($mpfr is a Math::MPFR object.) ############# I-O FUNCTIONS $ul = Rmpc_inp_str($rop, $stream, $base, $rnd); Input a string in base $base from $stream, rounded according to $rnd, and put the read complex in $rop. Each of the real and imaginary parts should be of the form X@Ym or, if the base is 10 or less, alternatively XeY or XEY. (X is the mantissa, Y is the exponent. The mantissa is always in the specified base. The exponent is always read in decimal. This function first reads the real part, followed by the imaginary part. The argument $base may be in the range 0,2..36. Return the number of bytes read, or if an error occurred, return 0. $ul = Rmpc_out_str([$pre,] $stream, $base, $digits, $op, $rnd [, $suf]); This function changed from 1st release (version 0.45) of Math::MPC. Output $op to $stream, in base $base, rounded according to $rnd. First the real part is printed, followed by the imaginary part. The base may be 0,2..36. Print at most $digits significant digits for each part, or if $digits is 0, the maximum number of digits accurately representable by $op. In addition to the significant digits, a decimal point at the right of the first digit and a trailing exponent, in the form eYYY , are printed. (If $base is greater than 10, "@" will be used as exponent delimiter.) $pre and $suf are optional arguments containing a string that will be prepended/appended to the output. Return the number of bytes written. (The contents of $pre and $suf are not included in the count.) $string = Rmpc_get_str($base, $how_many, $op, $rnd); Convert $op to a string containing the real and imaginary parts of $op. The number of significant digits for both real and imaginary parts is specified by $how_many. It is also possible to let $how_many be zero, in which case the number of digits is chosen large enough so that re-reading the printed value with the same precision, assuming both output and input use rounding to nearest, will recover the original value of $op. See the mpc documentation for details. Rmpc_get_dc($cc, $op, $rnd); Rmpc_get_ldc($lcc, $op, $rnd); Set the 'double _Complex'/'long double _Complex' object to the value of $op, rounded according to $rnd. Needs an mpc library (version 0.9 or later) that has been built with support for these data types. #################### OPERATOR OVERLOADING Overloading works with numbers, strings (bases 2, 10, and 16 only - see step '4.' below) and Math::MPC objects. Overloaded operations are performed using the current "default rounding mode" (which you can determine using the 'Rmpc_get_default_rounding_mode' function, and change using the 'Rmpc_set_default_rounding_mode' function). Be aware that when you use overloading with a string operand, the overload subroutine converts that string operand to a Math::MPC object with *current default precision*, and using the *current default rounding mode*. Be aware also, that the sign of zero is not always handled correctly by the overload subroutines. If it's important to you that the sign of zero be handled correctly, don't use the overloaded operators. (For multiplication, division, addition and subtraction the sign of zero will be handled correctly by the overloaded operators if both operands are Math::MPC objects.) For the purposes of the overloaded 'not', '!' and 'bool' operators, a "false" Math::MPC object is one with real and imaginary parts that are both "false" - where "false" currently means either 0 or NaN. (A "true" Math::MPC object is, of course, simply one that is not "false".) The following operators are overloaded: + - * / ** sqrt (Return object has default precision) += -= *= /= **= (Precision remains unchanged) == != ! bool abs (Returns an MPFR object, blessed into package Math::MPFR) exp log (Return object has default precision) sin cos (Return object has default precision) = (The copy has the same precision as the copied object.) "" Attempting to use the overloaded operators with objects that have been blessed into some package other than 'Math::MPC' will not work. The workaround is to convert this "foreign" object to a Math::MPC object - thus allowing it to work with the overloaded operator. In those situations where the overload subroutine operates on 2 perl variables, then obviously one of those perl variables is a Math::MPC object. To determine the value of the other variable the subroutine works through the following steps (in order), using the first value it finds, or croaking if it gets to step 6: 1. If the variable is an unsigned long then that value is used. The variable is considered to be an unsigned long if (perl 5.8 on) the UOK flag is set or if (perl 5.6) SvIsUV() returns true.(In the case of perls built with -Duse64bitint, the variable is treated as an unsigned long long int if the UOK flag is set.) 2. If the variable is a signed long int, then that value is used. The variable is considered to be a signed long int if the IOK flag is set. (In the case of perls built with -Duse64bitint, the variable is treated as a signed long long int if the IOK flag is set.) 3. If the variable is a double, then that value is used. The variable is considered to be a double if the NOK flag is set. (In the case of perls built with -Duselongdouble, the variable is treated as a long double if the NOK flag is set.) 4. If the variable is a string (ie the POK flag is set) then the value of that string is used. If the POK flag is set, but the string is not a valid number, the subroutine croaks with an appropriate error message. If the string starts with '0b' or '0B' it is regarded as a base 2 number. If it starts with '0x' or '0X' it is regarded as a base 16 number. Otherwise it is regarded as a base 10 number. 5. If the variable is a Math::MPC object then the value of that object is used. 6. If none of the above is true, then the second variable is deemed to be of an invalid type. The subroutine croaks with an appropriate error message. ##################### MISCELLANEOUS $ui = MPC_VERSION_MAJOR; Returns the 'x' in the 'x.y.z' of the MPC library version. Value is as specified by the header file (mpc.h) that was used to build Math::MPC. $ui =MPC_VERSION_MINOR; Returns the 'y' in the 'x.y.z' of the MPC library version. Value is as specified by the header file (mpc.h) that was used to build Math::MPC. $ui = MPC_VERSION_PATCHLEVEL; Returns the 'z' in the 'x.y.z' of the MPC library version. Value is as specified by the header file (mpc.h) that was used to build Math::MPC. $ui = MPC_VERSION(); An integer value derived from the library's major, minor and patchlevel values. Value is as specified by the header file (mpc.h) that was used to build Math::MPC. $ui = MPC_VERSION_NUM($major, $minor, $patchlevel); Returns an integer in the same format as used by MPC_VERSION, using the given $major, $minor and $patchlevel. Value is as specified by the header file (mpc.h) that was used to build Math::MPC. $string = MPC_VERSION_STRING; $string contains the MPC library version ('x.y.z'), as defined by the header file (mpc.h) that was used to build Math::MPC $string = Rmpc_get_version(); $string contains the MPC library version ('x.y.z'), as defined by the mpc library being used by Math::MPC. $MPFR_version = Math::MPC::mpfr_v(); $MPFR_version is set to the version of the mpfr library being used by the mpc library that Math::MPC uses. (The function is not exportable.) $GMP_version = Math::MPC::gmp_v(); $GMP_version is set to the version of the gmp library being used by the mpc library that Math::MPC uses. (The function is not exportable.) ####################

For completeness, we probably should wrap mpc_realref and mpc_imagref - though I don't think there's much to be achieved by doing this in a *perl* context.

You can get segfaults if you pass the wrong type of argument to the functions - so if you get a segfault, the first thing to do is to check that the argument types you have supplied are appropriate. Also, as mentioned above in the "OPERATOR OVERLOADING" section, the overloaded operators are not guaranteed to handle the sign of zero correctly.

This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. Copyright 2006-2009, 2010, 2011 Sisyphus

Sisyphus <sisyphus at(@) cpan dot (.) org>

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