HP 49g Graphing Calculator - Manual (Page 105)

You can set the factor by which you zoom in or zoom out by changing the
values on the Zoom Factors input form.
1. Press
ZFACT
to select
zoom factor
.
2. Change the values in the H-Factor and V-Factor fields.
Keep the values you enter the same if you want zooming to be
horizontally and vertically proportional. (See also “Forcing a
proportional zoom” below.)
3. If you want zooming to center around the position of your cursor,
check the Recenter at Crosshairs field.
4. Press
OK.
Forcing a proportional zoom
Press
ZSQR
to select
zoom square
.
The plot is redrawn with the vertical scale the same as the horizontal
scale.
Resetting the zoom default
Press
ZDFLT
to select
ZOOM DEFAULT.
The plot is redrawn using the default
display ranges.
Setting the zoom factor
Analyzing Functions
The HP 49G provides numerous tools for analyzing the mathematical
properties of fimctions. For example, you can calculate roots, extrema,
slopes, areas, and the point of intersection of two graphs.
Wliere you have plotted more than one function, you may first need to
select the function you want to analyze. By default, the first function listed
on the Plot Fimctions screen is the fimction that is selected.
To select another function for analysis:
1. Press
TRACE
to turn on trace mode. (See “Tracing a plot” on page 4-35.)
2. Press ® or ® until the cursor is on the function you want to analyze.
You can also select another function by pressing
nxeq
(found on
the second page of the
function
menu). In this case, you do not
need to be in trace mode.
Plotting graphs Page 4-37