HP 49g+ - Manual (Page 417)

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 @EDITL @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.