an expression on every row column_maker.py $input $out_file1 "$cond" $round ${input.metadata.columns} "${input.metadata.column_types}" NO YES

.. class:: infomark **TIP:** If your data is not TAB delimited, use *Text Manipulation->Convert* ----- **What it does** This tool computes an expression for every row of a query and appends the result as a new column (field). - Columns are referenced with **c** and a **number**. For example, **c1** refers to the first column of a tab-delimited file - **c3-c2** will add a length column to the query if **c2** and **c3** are start and end position ----- **Example** If this is your input:: chr1 151077881 151077918 2 200 - chr1 151081985 151082078 3 500 + computing "c4*c5" will produce:: chr1 151077881 151077918 2 200 - 400.0 chr1 151081985 151082078 3 500 + 1500.0 if, at the same time, "Round result?" is set to **YES** results will look like this:: chr1 151077881 151077918 2 200 - 400 chr1 151081985 151082078 3 500 + 1500 You can also use this tool to evaluate expressions. For example, computing "c3>=c2" for Input will result in the following:: chr1 151077881 151077918 2 200 - True chr1 151081985 151082078 3 500 + True or computing "type(c2)==type('') for Input will return:: chr1 151077881 151077918 2 200 - False chr1 151081985 151082078 3 500 + False