# Fast 3d Plots - HP 49g+ User Manual

Graphing calculator.

The
key simply changes the font in the table from small to big, and
@ @ B I G @
vice versa. Try it.
The
key, when pressed, produces a menu with the options: In, Out,
@ Z O O M
Decimal, Integer, and Trig. Try the following exercises:
With the option In highlighted, press
that the x-increment is now 0.25 rather than 0.5. Simply, what the
calculator does is to multiply the original increment, 0.5, by the zoom
factor, 0.5, to produce the new increment of 0.25. Thus, the zoom in
option is useful when you want more resolution for the values of x in
To increase the resolution by an additional factor of 0.5 press
select In once more, and press
0.0125.
To recover the previous x-increment, press
the option Un-zoom. The x-increment is increased to 0.25.
To recover the original x-increment of 0.5 you can do an un-zoom
again, or use the option zoom out by pressing
The option Decimal in
The option Integer in
The option Trig in produces increments related to fractions of , thus
being useful when producing tables of trigonometric functions.

## Fast 3D plots

Fast 3D plots are used to visualize three-dimensional surfaces represented by
equations of the form z = f(x,y). For example, if you want to visualize z =
2
2
f(x,y) = x
+y
, we can use the following:
. The table is expanded so
@ @ @ O K @ @ @
. The x-increment is now
@ @ @ O K @ @ @
@ Z O O M
produces x-increments of 0.10.
@ Z O O M
produces x-increments of 1.
@ Z O O M
`
,
@ Z O O M
to select
@ @ @ O K @ @ @
.
@ Z O U T
@ @ @ O K @ @ @
.
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