### Add Gaussian / uniform white noise

`addnoise [-r# | -v#] [-u -0 -o` outfile`-l# -x# -c# -V# -h]` file(s)

> `-r` absolute noise level
> `-v` same as fraction of standard deviation
> `-u` add uniform noise (default Gaussian)
> `-0` do not read input, just issue random numbers
> `-l` number of values to be read (all)
> `-x` number of values to be skipped (0)
> `-c` column to be read (1 or file,#)
> `-o` output file name, just `-o` means file`_noisy`
> `-V` verbosity level (0 = only fatal errors)
> `-h` show this message

Adds Gaussian noise of rms amplitude given by `-r` to data in file(s). The amplitude can also be given (`-v`) as a fraction of the rms amplitude of the data. With `-u`, uniform noise in [0:`#`] is added, `#` given by `-r` or `-v`. Either `-r` or `-v` must be present. Output file file`_noisy`.

If `-0` is given, no input files are read. Instead, `-l` random numbers of magnitude `-r` are produced.

See also makenoise which uses a different random umber generator.

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