dataframe

    my $df = dataframe(...);

Creates a Data::Frame object.

factor

    my $logical = factor(...);

Creates a PDL::Factor object.

logical

    my $logical = logical(...);

Creates a PDL::Logical object.

BAD

    my $bad = BAD($n);

A convenient function for generating all-BAD piddles of the given length.

NA

This is an alias of the "BAD" function.

ifelse

    my $rslt_piddle = ifelse($test, $yes, $no)

This function tries to do the same as R's "ifelse" function. That is, it returns a piddle of the same length as $test, and is filled with elements selected from $yes or $no depending on whether the corresponding element in $test is true or false.

$test, $yes, $no should ideally be piddles or coerce-able to piddles.

is_discrete

    my $bool = is_discrete(ColumnLike $x);

Returns true if $x is discrete, that is, an object of below types,

• PDL::Factor
• PDL::SV

guess_and_convert_to_pdl