HP -28S Quick Reference page 41

• SHIFT-cursor moves the cross-hair to the top, bottom, left or right
• INS puts the current coordinates of the cross-hair as a complex
• DEL retrieves a copy of the display data into a string (without the
• Press ON to quit the interactive mode.
The INS-feature is extremely useful. It allows for:
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PPAR Returns the PPAR list. Use menu commands or 'PPAR' STO to store
new parameters.
RES Stores a real number in PPAR which determines the resolution of the
plot.
For n=1 a point is displayed in every LCD column, for n=2 in every 2md
column etc. Larger values of the resolution speed up the plot process!
AXES Takes a complex argument from the stack and stores it in PPAR as
coordinate of the intersection of the plot axes. This is usually (0,0).
CENTR Takes a complex argument and modifies the parameters Pmin and Pmax
in PPAR so that the given point is displayed in the middle of the LCD
screen. The height and width of the plot are not changed.
*W Takes a real argument and multiplies the x-coordinates of Pmin and
Pmax with it. Ie. 2 *W displays a larger x-area or "zooms out".
On the other hand 0.5 *W displays a smaller area or "zooms in".
*H Takes a real argument and multiplies the y-coordinates of Pmin and
Pmax with it.
STO∑ Store a matrix in statistics variable ∑DAT. See STAT Menu and
Reserved Variables.
Recall statistics matrix ∑DAT. See STAT Menu.
RCL∑
COL∑ Takes two real arguments that define two columns of the statistics data
matrix ∑DAT which are used to plot statistics data. See DRW∑ and
STAT Menu.
SCL∑ Modifies Pmin and Pmax in PPAR so that a DRW∑ plot will fit exactly into
the LCD display.
DRW∑ Calls DRAX to draw the axes and then plots statistics data stored in
matrix ∑DAT. Horizontal values are taken from the independent-variable
column (usually 1), vertical values are taken from the dependent-
variable column (usually 2). See COL∑ and STAT Menu.
When invoked by pressing the DRW∑ menu key the interactive mode is
activated, see above.
CLLCD Clear the entire LCD screen.
DIGTIZ Activate the interactive digitization cross-hair on the current display.
cursor over the plot.
edge of the plot.
number onto the stack (without changing to the stack view). INS can
be pressed repeatedly to digitize multiple points.
cross-hair).
This is identical to the LCD→ command in the STRING Menu.
Note that older versions of the Reference Manual describe this
command differently.
Finding initial guess for the solver. See SOLV Menu.
Moving the center of the plot to an interesting location, see CENTR.
Cutting off uninteresting areas of the plot, see PMIN and PMAX.
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