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WLPLOT.HLP
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1994-03-07
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Help File for WL-Plot Last Modified March 7, 1994
THIS FILE IS FORMATTED FOR USE BY WL-PLOT. DO NOT EDIT THE FILE IN ANY
WAY!
~begindeclarations
~wlplot -44936
~functions -43559
~conic_sections -43077
~derivatives -42666
~relation -42273
~bifurcations -41741
~recursions -40795
~curve_fit -40228
~use_cga -39673
~exit -39000
~rpn -38886
~entering_function -37971
~cartesian -36404
~polar -35965
~parametric -35541
~steps -35297
~radian_mode -34614
~show_axis -34335
~grid -34011
~overlay -33685
~inverse -33298
~log_axis -32958
~reset_plotting_area -32037
~min_max -31871
~purge -31045
~variable_values -30771
~domain -29757
~domain_based_on_x_min_max -28991
~plot -28542
~view -28314
~print -28176
~save -27799
~retrieve -27272
~save_pcx -26739
~retrieve_pcx -26033
~quit -25329
~conic_type -25208
~conic_steps -24314
~focal_points -23952
~conic_standard_variable_values -23635
~conic_general_variable_values -22561
~show_function -21605
~deriv_min_max -21101
~integral_constant -19841
~relat_entering_functions -18995
~resolution -17881
~relat_variable_values -17087
~relat_plot -16182
~bifurc_entering_functions -15598
~bifurcation_recursion_loops -14712
~recurs_entering_functions -13581
~recursion_loops -12441
~clear_data_points -11490
~number_of_data_points -11298
~edit_data_points -10938
~cfit_linear_type -9704
~cfit_exp_type -9515
~cfit_log_type -9273
~cfit_pow_type -9067
~cfit_poly_type -8841
~cfit_best_type -8216
~cfit_none_type -7952
~cfit_plot -7318
~cfit_save -6992
~cfit_retrieve -6192
~automatic -5402
~cfit_min_max -4935
~scale -4717
~scale_title -4545
~axis_interval -4321
~cfit_overlay -4039
~cfit_steps -3269
~cfit_plotchar -2819
~plot_title -2331
~axis_title -1967
~cfit_plot_graph -1754
~cfit_return_menu -1529
~zoom -1371
~enddeclarations
~wlplot
WL-Plot 2.50
Copyright 1990-94, Wesley Loewer
WL-Plot stands for "Wesley Loewer's Plotting Program." This program was
written in response to the need for simple yet effective tools specifically
designed for classroom use. Feel free to make copies of WL-Plot for anyone
who can make use of it.
This program is available free of charge for educational use only. I would
appreciate a post-card from anyone who uses the program. This serves no
purpose other than to give me a pat on the back and to let me know that I
have contributed to the education of more people than I could have reached
directly. If WL-Plot should prove useful to someone outside of an
educational setting (such as in a job or even research), the file
WLPLOT.DOC contains information on purchasing WL-Plot for such use.
Send any questions, suggestions, inservice inquiries, etc... to:
Wesley B. Loewer or Wesley B. Loewer
78 S. Circlewood Glen McCullough High School
The Woodlands, TX 77381 3800 S. Panther Creek Dr.
U.S.A The Woodlands, TX 77381
(713) 292-3449 (voice) U.S.A
(713) 292-4455 (voice)
Internet: loewer@tenet.edu
~
~functions
Functions
The Functions module allows the user to graph functions using either
Cartesian or Polar coordinates. Also, the user can graph Parametric graphs
in Cartesian coordinates where the horizontal and vertical variables are
both functions of a third independent variable.
The user can skip the menu and go straight to the Function module by
entering "wlplot functions" or just "wlplot f" at the DOS command line.
~
~conic_sections
Conic Sections
This module allows the user to easily graph the various quadratic (degree
2) equations: Parabolas, Circles, Ellipses, and Hyperbolas as well as the
degenerate cases: Lines, Parallel Lines, and Points.
The user can skip the menu and go straight to the Conics module by entering
"wlplot conics" or just "wlplot co" at the DOS command line.
~
~derivatives
Derivatives & Integrals
The Derivatives & Integrals module will graph functions, 1st derivatives,
2nd derivatives and indefinite integrals. These can be plotted at the same
time or individually.
The user can skip the menu and go straight to the Derivatives module by
entering "wlplot derivatives" or just "wlplot d" at the DOS command line.
~
~relation
Relation Plotter
The Relation Plotter module is a slow, but extremely powerful grapher. It
allows the user to graph relations that are not necessarily functions.
This is very useful for situations in which it is difficult, or even
impossible, to solve for one variable. It can also be used for systems of
inequalities.
The user can skip the menu and go straight to the Relation Plotter module
by entering "wlplot relation" or just "wlplot rel" at the DOS command line.
~
~bifurcations
Bifurcations
Bifurcations are a type of fractal that is based on a recursive formula,
that is, a formula in which the dependent variable is a function of both
the independent variable and itself. The dependent variable must start off
with some initial value. The formula is evaluated and this result is then
plugged back into the formula for the dependent variable. This process is
reiterated numerous times. Often, the resultant values will start
repeating, or repeating every other time, every fourth time, etc... When
the pattern changes from every n'th time to 2n'th time, the graph is said
to bifurcate, or split. On the other hand, the values may start bouncing
around with no apparent pattern and is said to be "Chaotic."
The user can skip the menu and go straight to the Bifurcation module by
entering "wlplot bifurcation" or just "wlplot b" at the DOS command line.
~
~recursions
Recursive Relations
The Recursive Relation Module allows a user to enter a recursive relation
in a such a manner that both the horizontal and vertical components can
depend on previous values. This can be very useful in determining the
attractors in certain fractals, such as the Henon Map and the "orbits"
involved in calculating such things as the Mandelbrot Set.
The user can skip the menu and go straight to the Recursive module by
entering "wlplot recursion" or just "wlplot rec" at the DOS command line.
~
~curve_fit
Curve Fitting
The Curve Fitting Module allows the user to enter a set of data points and
find a "best fit" line or curve according to various mathematical models.
The models included in this program are Linear, Exponential, Logarithmic,
Power, and Polynomial (up to degree 9). The user can also enter titles and
labels appropriate for a lab course.
The user can skip the menu and go straight to the Curve Fitting module by
entering "wlplot curve-fit" or just "wlplot cf" at the DOS command line.
~
~use_cga
Use CGA Graphics
The Use CGA Graphics option forces WL-Plot to use CGA graphics mode, even
if VGA mode is available. This is useful if the DOS version being used is
earlier than 4.0. Prior to this version, DOS's GRAPHICS command did not
come with the capability of printing graphic screens in any mode other than
CGA mode.
The option can also be turned on from the command line by entering
"wlplot cga" at the command prompt. If this is done, then WL-Plot can be
run with about 20K less memory available. If the Use CGA Graphics option
is turned on at the command line, it cannot be turned off within the
program.
~
~exit
Exit
Short-Cut key: <Alt-X>
Exits WL-Plot and returns to DOS.
~
~rpn
Algebraic & RPN Syntax
Normally, Algebraic mode is recommended. This allows the user to enter
equations much like they would be written on paper. To use Algebraic
notation, leave the RPN option turned off. Occasionally,