## Name

chan_mult — multiply columns of data by a given factor

chan_add — add a given value to columns of data

## Synopsis

`chan_mult` `factor` `num_columns` `column` [ `column` `column`... ] `<` `infile` `>` `outfile`

`chan_add` `value` `num_columns` `column` [ `column` `column`... ] `<` `infile` `>` `outfile`

## DESCRIPTION

Mult_chan will multiply all numbers in the specified columns by the given factor. The infile is an ASCII file, with columns separated by white space. The columns are numbered from 0 to (n-1). Add_chan behaves analogously, but with addition rather than multiplication.

## EXAMPLES

These routines are useful for converting between units in animation tables.

To multiply all but the first column of a four column file by 2.54:

chan_mult 2.54 4 1 2 3

To add ten to the first six columns of an eight-column file:

chan_add 10.0 8 0 1 2 3 4 5

To convert the second of three columns from Fahrenheit to Celsius:

chan_add -32 3 1 chan_mult 0.56 3 1

## BUGS

The files must contain numbers and whitespaces only.

## AUTHOR

Carl J. Nuzman

## COPYRIGHT

This software is Copyright (c) 1994-2013 by the United States Government as represented by U.S. Army Research Laboratory.

## BUG REPORTS

Reports of bugs or problems should be submitted via electronic mail to <devs@brlcad.org>.