# Description of the program: low121

This program applies a simple low pass filter in the time domain. The filter works as follows:
x'n=(xn-1+2xn+xn+1)/4

## Usage:

low121 [Options]

Everything not being a valid option will be interpreted as a potential datafile name. Given no datafile at all, means read stdin. Also - means stdin

Possible options are:

Option | Description | Default
--- | --- | ---
-l# | number of data to use | whole file
-x# | number of lines to be ignored | 0
-c# | column to be read | 1
-i# | number of iterations | 1
-V# | verbosity level (0: only save the last iteration otherwise: save all iterations) | otherwise
-o# | output file name | 'datafile'.low.n, where n is the iteration (or stdin.low.n if stdin was read) without -o the last iteration is also written to stdout
-V# | verbosity level 0: only panic messages 1: add input/output messages 2: print each iteration to a separate file | 1
-h | show these options | none

## Description of the Output:

Depending on the the -V flag one or more files are produced. Each of the files contains one column, consisting of the filtered time series.

View the C-sources

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