# 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 Celcius:

chan_add -32 3 1
chan_mult 0.56 3 1

# BUGS

The files must contain numbers and whitespaces only.

# AUTHOR

Carl J. Nuzman

# "BUG REPORTS"

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