# Barsky Code

## Archive

barsky.tgz and barsky.zip

## Description

Sandra Barsky's code, written in C, which solves non-linear time-dependent
2-D equations.
In particular, the equation should have the form

(d/dt)u= (\nabla^2) u + g(x,y,u) + f(x,y)

with periodic boundary conditions.
The function g is easily tunable.
The code is written as a primarily instructional code for a student who might
have some familiarity with linear multigrid, and would want a slightly more
general approach, or a student who can solve a linear boundary equation, but
is now looking to include time.
There are no detailed explanations of what restriction or prolongation do, but
more details are provided in how the linearization occurs and what happens as
a function of time.

## Archive Contents

There are two files in the archives
barsky.tgz and
barsky.zip:

barsky:
total 56
-rw-r--r-- 1106 Sep 4 2006 README.txt
-rw-r--r-- 23685 Sep 4 2006 nl.c