NAME

Data::Frame::Indexer - Function interface for indexer

VERSION

version 0.006004

DESCRIPTION

A basic feature needed in a data frame library is the ability of subsetting a data frame by either numeric indices or string labels of columns and rows. Because of the ambiguity of number and string in Perl, there needs a way to allow user to explicitly specify whether their indexer is by numeric indices or string labels. This modules provides functions that serves this purpose.

FUNCTIONS

indexer_s

    indexer_s($x)

Returns either "undef" or an indexer object, by trying below rules,

If called with "undef", returns "undef".
If the argument is an indexer object, just returns it.
If the argument is a PDL of numeric types, create an indexer object
of Data::Frame::Indexer::Integer
Fallbacks to create an indexer object of
Data::Frame::Indexer::Label.

indexer_i

    indexer_i($x)

Similar to "indexer_s" but would fallback to an indexer object of Data::Frame::Indexer::Integer.

AUTHORS

Zakariyya Mughal <zmughal@cpan.org>
Stephan Loyd <sloyd@cpan.org>

COPYRIGHT AND LICENSE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.