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
See Interactive Mode above.
PIXEL Takes a complex number from the stack and sets the pixel specified by
the real part (horizontal position from left) and imaginary part (vertical
position from bottom).
The current coordinate system settings in PPAR are obeyed! If the x and
y positions need to actually refer to raw LCD pixels originating at the
bottom-left corner then enter: (0 0) PMIN (137 32) PMAX.
DRAX Draw a horizontal and vertical coordinate axis. The location of point
(0,0) is specified by the PPAR variable. Tick marks are added every 10
pixel.
CLMF Clear Message Flag.
Commands CLLCD, DISP, PIXEL, DRAX, DRAW, und DRW set the
"message flag" which suppresses the normal stack display.
CLMF clears the message flag and thus redisplays the normal stack view.
PRLCD Print the current contents of the LCD screen.
Parameterized
Curves
The following program PPLOT expects:
On stack level 2 a program that takes the parameter T from the
stack and returns a complex number (x(T),y(T)).
On stack level 1 a length-3 list containing the start and end values
and the step-size of parameter T.
<< LIST DROP F MI MA S << CLLCD DRAX
MI MA FOR X X F EVAL PIXEL S STEP DIGTZ >>
'PPLOT' STO
Usage example (degrees selected):
<<DUP SIN 2 * SWAP COS RC>> {0 360 6} PPAR
draws an ellipse.
<<DUP 2 * SIN SWAP COS RC>> {0 360 6} PPAR
draws a hour glass.
USER Menu
General Displays the names of the variables of the current directory in six "soft
labels" on the bottom of the LCD screen.
NEXT
PREV
Used to display the next or previous six entries or press USER again to
display the first six entries.
Menu key
press
When one of the white menu keys below the display is pressed the
associated variable is evaluated immediately and thus the variable
content is returned to the stack or the program executed or the current
directory is changed. For directories see MEMORY Menu.
Retrieving
variable
names
To avoid evaluation enter a single quote and then press the menu key.
This will append the variable/program/directory name to the command
line rather than evaluating it.
Not available for the HOME directory name.
Soft-Label
names
The menu name is derived from the first few characters of the variable
name. Lower case characters are displayed in upper case.
Warning: Variable names are case sensitive so the menu may display
two entries with the same name that actually refer to different variables!
However, when retrieving the variable name (see above) the correct
name is returned.
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