from_csv

    from_csv($file, :$header=true, :$sep=',', :$quote='"',
             :$na=[qw(NA BAD)], :$col_names=undef, :$row_names=undef, 
             Map[Str, DataType] :$dtype={},
             :$strings_as_factors=false)

Create a data frame object from a CSV file. For example,

    my $df = Data::Frame->from_csv("foo.csv");

Some of the parameters are explained below,

• $file

  This can be a file name string, a Path::Tiny object, or an opened file handle.

• $dtype

  A hashref associating column names to their types. Types can be the PDL type names like "long", "double", or "pdlsv", "factor", "datetime", "logical". If a column is not specified in $dtype, its type is automatically decided.

• $na

  An arrayref of strings which are to be interpreted as "BAD" values. Blank fields are also considered to be missing value in logical and numeric fields.

to_csv

    to_csv($file, :$sep=',', :$quote='"', :$na='NA',
           :$col_names=true, :$row_names=true)

Write the data frame to a csv file.