HP -28S Quick Reference

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Brand: HP

Category: Calculator

Type: Quick reference for HP HP-28S

Pages: 49

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HP-28S
Unfortunately, X cannot be a local variable so it is not possible to
write a program that implements a function of a local variable and
where the function is solved for the local variable. See the example
program for the factorial function FACT in the REAL Menu.
When the root finding process is interrupted by pressing ON the function
and variable name are returned as well as the current best solution. Thus
it is possible to continue the search by simply pressing ROOT again.
PLOT Menu
General
The PLOT menu commands allow to display function curves or
statistical data on the graphics LCD display.
The HP-28S display has a resolution of 137x32 pixel.
The function to be plotted is stored in the global variable EQ.
This variables is also used by the solver, see SOLV Menu.
Statistical data to be plotted is stored in the global matrix DAT, see
STAT Menu.
Drawing commands automatically set the "message flag" which
suppresses the normal stack display until either a key is pressed or
CLMF is called.
Graphical data points are represented by complex numbers where
the real part specifies the horizontal x-coordinate (from left to right)
and the imaginary part the vertical y-coordinate (from bottom to
top).
Note that it is not possible to "overlay" multiple curves in interactive
mode. As a maximum two curves can be plotted by using an
equation, see STEQ.
However, the non-interactive mode (see DRAW) can be used to
overlay an arbitrary number of plots.
To draw graphics other than functions, ie. parameterized curves in
the form (x(t),y(t)) or histograms etc. the PIXEL command can be
used, see further down and
Parameterized Curves
at the end of this
section.
Follow these general steps to create a function plot:
1. Store the desired function in variable EQ using STEQ.
2. Choose the independent variable using INDEP.
3. Optionally use PMIN, PMAX, and CENTR to specify the limits of the
plot area.
4. Optionally use RES to select the resolution of the plot.
5. Press DRAW.
PPAR A global list containg data to control graphical plots. It contains in this
order:
A complex number specifying the lower left corner Pmin of the plot.
Set by PMIN.
A complex number specifying the upper right corner Pmax of the
plot. Set by PMAX.
The independent variable for the plot. Set by INDEP.
A real number specifying the resolution of the plot. Set by RES.
A complex number specifying the coordinates of the intersection of
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