HP 48GII, Руководство пользователя, Страница: 421 / 864

Page 12-40
•
Press
„ô
, simultaneously if in RPN mode, to access to the PLOT
SETUP window.
•
Change
TYPE
to
Ps-Contour.
•
Press
˜
and type ‘X^2+Y^2’
@@@OK@@@
.
•
Make sure that ‘X’ is selected as the
Indep:
and ‘Y’ as the
Depnd:
variables.
•
Press
L @@@OK@@@
to return to normal calculator display.
•
Press
„ò
, simultaneously if in RPN mode, to access the PLOT
WINDOW screen.
•
Keep the default plot window ranges to read:
X-Left:-2, X-Right:2, Y-Near:-1
Y-Far: 1, Step Indep: 10, Depnd: 8
•
Press
@ERASE @DRAW
to draw the contour plot. This operation will take some
time, so, be patient. The result is a contour plot of the surface. Notice
that the contour are not necessarily continuous, however, they do provide
a good picture of the level surfaces of the function.
•
Press
@EDIT L @LABEL @MENU
to see the graph with labels and ranges.
•
Press
LL @)PICT@CANCL
to return to the PLOT WINDOW environment.
•
Press
$
, or
L @@@OK@@@
, to return to normal calculator display.
Try also a Ps-Contour plot for the surface z = f(x,y) = sin x cos y.
•
Press
„ô
, simultaneously if in RPN mode, to access the PLOT SETUP
window.
•
Press
˜
and type ‘SIN(X)*COS(Y)’
@@@OK@@@
.
•
Press
@ERASE @DRAW
to draw the slope field plot. Press
@EDIT L @)LABEL @MENU
to see the plot unencumbered by the menu and with identifying labels.