## DESCRIPTION

*v.perturb*
reads a vector map of points and writes the same points but
*perturbs* the eastings and northings by
adding either a uniform or normal delta value. Perturbation means that
a variating spatial deviation is added to the coordinates.
## NOTES

The uniform distribution is always centered about zero.
The associated *parameter* is constrained to be positive and
specifies the maximum of the distribution; the minimum is
the negation of that parameter. Do perturb into a ring around the
center, the *minimum* parameter can be used.
Usually, the mean (first parameter) of the normal
distribution is zero (i.e., the distribution is centered at
zero). The standard deviation (second parameter) is
naturally constrained to be positive.

Output vector points are not guaranteed to be contained within the
current geographic region.

## SEE ALSO

*v.random*

*v.univar*

## AUTHOR

James Darrell McCauley

when he was at:
Agricultural Engineering
Purdue University
Random number generators originally written in FORTRAN by Wes Peterson and
translated to C using *f2c*.

*Last changed: $Date$*