File LAPLACE.ZIP from The Programmer’s Corner in
Category Science and Education
Solves Laplace’s equation in two dimensions.
File Name File Size Zip Size Zip Type
GRID.C 2483 1032 deflated
GRID.DOC 1711 796 deflated
HSORT.C 5183 2144 deflated
LAPLACE.C 37039 11041 deflated
LAPLACE.DOC 10946 3895 deflated
LAPLACE.EXE 33792 17684 deflated
MKFILE 440 155 deflated
PLATES 125 99 deflated
PLATES.CNT 6604 1575 deflated
PLATES.POT 7633 2052 deflated
SOLVE.C 8390 2484 deflated

## Contents of the GRID.DOC file

NAME
grid

DESCRIPTION

LAPLACE solves Laplace's equation in two dimensions using a square
grid and writes a file of calculated potentials at grid points.
GRID reads this file and generates a display file for the grid
itself. GRAPH (in PC-BLUE volume 230) can be used display this
grid, superimposed on the original boundaries and/or the contours
calculated by CONTOUR. Seeing the grid makes it easier to judge
whether it is fine enough for realistic results.

EXAMPLE
A>laplace plates -m 3
A>grid plates.pot >plates.g
A>graph plates plates.g -m 1 1 3 -e

LAPLACE reads the boundary conditions in "plates" and writes its
output to "plates.pot". GRID's output is written to "plates.g".
GRAPH displays both "plates" and "plates.g". The arguments of the
-m switch tell GRAPH to display the two curves in "plates" in line
style 1 (white solid line of width 1) and the single curve in
"plates.g" in line style 3 (white dotted line of width 1). The -e
switch forces GRAPH to make the x and y scales equal to avoid
distortion.

A>contour plates.pot
A>graph plates plates.g plates.cnt -m 1 1 60 10 -e

CONTOUR writes its output to "plates.cnt". The arguments of the -m
switch tell GRAPH to display the grid in color 6 (gray on an EGA)
and contours in color 1 (yellow on an EGA).

AUTHOR
James R. Van Zandt , 27 Spencer Dr., Nashua NH 03062,
603-888-2272. Resale forbidden, distribution encouraged, comments
welcome.

December 24, 2017