By default, leaf.table.Spread will simply apply the APL monadic format to any numeric data. You may override this cell by cell with a format specification to be used as the left argument of ŒFMT. Note that no checking or error trapping is done, so invalid specifications will cause APL errors in Spread or List.

leaf.table.Qfmt 'I2' 'CF8.2'

The vector of format specifications will be reshaped to match the data.

Tip: to get correct alignment on integer data with parenthesised negatives, use ‘decimal0’ alignment which will leave sufficient space after the last digit to exdent the closing parenthesis.