Kevin Ryde > Math-NumSeq-64 > Math::NumSeq::Even

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Module Version: 64   Source   Latest Release: Math-NumSeq-69

# NAME

Math::NumSeq::Even -- even integers

# SYNOPSIS

``` use Math::NumSeq::Even;
my \$seq = Math::NumSeq::Even->new;
my (\$i, \$value) = \$seq->next;```

# DESCRIPTION

The even integers,

```    0, 2, 4, 6, 8, 10, ...
starting i=0```

# FUNCTIONS

See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.

`\$seq = Math::NumSeq::Even->new ()`

Create and return a new sequence object.

## Iterating

`\$seq->seek_to_i(\$i)`

Move the current sequence position to `\$i`. The next call to `next()` will return `\$i` and corresponding value.

`\$seq->seek_to_value(\$value)`

Move the current i so that `next()` gives `\$value` on the next call, or if `\$value` is an even integer then the next higher even.

## Random Access

`\$value = \$seq->ith(\$i)`

Return `2*\$i`.

`\$bool = \$seq->pred(\$value)`

Return true if `\$value` is even.

`\$i = \$seq->value_to_i_ceil(\$value)`
`\$i = \$seq->value_to_i_floor(\$value)`

Return value/2 rounded up or down to the next integer.

`\$i = \$seq->value_to_i_estimate(\$value)`

Return an estimate of the i corresponding to `\$value`.

http://user42.tuxfamily.org/math-numseq/index.html