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1989-04-09
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PLOTSURF
This program plots the graphs of functions of two variables,
such as z = f(x,y) = x^3 - 3*x*y^2. Plots of the surface are
made in color in true perspective and plots of level curves
and the gradient vector field are available. After a
perspective plot has been made and saved, these can be
recalled overwritten with demonstrations of partial and
directional derivatives.
Required Hardware: IBM PC or IBM AT or close compatible with
EGA (Enhanced Graphics Adapter) and EGA Color Monitor.
276,000 bytes of free memory are required, including that
needed to save one full-screen image. The program will run
in 165,000 bytes of memory, but a perspective plot cannot be
saved and the derivative demonstrations will not be
available.
It was written for the use of Calculus students, who have
little experience with computers, in connection with our
courses Calculus I and Calculus IV. It is therefore provided
with no documentation, beyond that which is provided on-line
by Selecting F1 from the Main Menu.
The program was written in True BASIC (tm) to show our more
advanced students what can be achieved by writing in that
language.
You may copy the program freely, give it to your friends,
post it on BBS, and/or whatever, excepting only selling it.
If you use it, I should greatly appreciate your comments,
especially on the adequacy of the instructions, and bug
reports.
Prof. Eugene Zaustinsky
Department of Mathematics
State University of New York
Stony Brook, New York 11794
(516) 632-8250
Home: (516) 757-4402
EXEC-PC BBS (414) 964-5160 N-8-1