HP 39gs Master Manual page 93

The effect of TRng
The X and Y ranges control the lengths of the axes. They determine how much of the function, when drawn,
will be visible. See the examples below. Notice that in both cases,
followed by an ordered pair giving (X,Y).
Unlike & , the effect of
XRng YRng
is displayed of the total picture.
For example...
As you can see above, changing the T range from 0 ≤ t ≤ 2
partially drawn. Of course, what constitutes "fully drawn" depends on the function used.
TStep controls smoothness
The value of the parameter
values of when evaluating the function for graphing. Making
T
too large will produces a graph which is not smooth. The example on
the right shows
TStep=0.5
gives a graph of:
gives a graph of:
is to decide how much of the graph is drawn at all, not how much
TRng
gives a graph of:
controls the jump between successive
TStep
instead of .
0.05
whereas..
π to 0 ≤ t ≤ 5 gives a graph that appears only
TStep
93
is on and shows the T value,