HP 48G - Page 15

lets you set horizontal and vertical zoom factors (the
default is 4), then [Tl zooms in by these factors;
zooms out (or you can scale each axis sepa-
rately via IIELN, [HTH, EERN and [EATH). B
squares the view (so a pixel is the same scale hori-
zontally as vertically); resets to default view-
ing ranges ([-6.5.6.5] x [-3.1,3.2]); centers the
screen on the crosshairs; autoscalesthe verti-
cal range. [HI3H] sets x-axis “tick” marks 1 unit apart
(so apixel =.1 units); sets them 10 units apart;
and m/2 units apart. isthe “undo zoom*
key; restores the interactive graphics menu.
The folder has interactive tools for analyzing
functions: puts the crosshairs on the nearest
root, displays it, and tags it (on the stack); cal-
culates the derivative of the function at the crosshairs,
displays it,and tagsit. Press IEIi3il once to mark the
lower limit of integration at the crosshairs (use to
move this “mark”); press i3l again to compute the
definite integral from that lower mark to the current
crosshairs position, display it, and tag it (integrating
right-to-left gives the negative of left-to-right).
snaps the crosshairs to the nearest extremum, dis-
plays it, and tags it. IIIEEH finds the function’s value
at the crosshair location, displays it, and tags it. Use
I to find the function’s derivative and graph it
with the original function; press I3l again to plot
the 2nd and 1st derivatives, and the function; etc.
Plotting Multiple Functions Together
To plot more than one function together on the same
graph, enter them into the Ei: field as a list (example:
£ 'THMCHY Y "STNCHY ' 1), If _2IMULT is checked in
the PLOT OPTIOM:= screen, all functions are drawn in
one sweep; if not, they’re drawn in successive sweeps.
Plotting “Split-Defined” Functions
A “split-defined” function’s definition depends on the
input. Example: ' IFTECR£], B, 1-82" (“Ifx< 1,
then use x*, elseuse 1 —x”) TryitasaFurzt iom
plot—default settings (but disable connected mode).
Other Plot Types
Use a Tr it b plot type to shade regions that satisfy
inequalities. Example: 'SINCH#Y1£.5' (Use de-
fault parameters—and be patient.)
13