HP (Hewlett-Packard) 50g ユーザーズマニュアル

Page 12-42

For example, to produce a Pr-Surface plot for the surface x = x(X,Y) = X sin Y, y 
= y(X,Y) = x cos Y, z=z(X,Y)=X, use the following:

Θ Press  „ô, simultaneously if in RPN mode, to access to the PLOT

SETUP window.  

Θ Change 

TYPE

 to 

Pr-Surface.

Θ Press  ˜  and type ‘{X*SIN(Y), X*COS(Y), X}’ @@@OK@@@.
Θ Make sure that ‘X’ is selected as the 

Indep: 

and ‘Y’ as the 

Depnd:

 variables.

Θ Press L@@@OK@@@ to return to normal calculator display.
Θ Press  „ò, simultaneously if in RPN mode, to access the PLOT

WINDOW screen.  

Θ Keep the default plot window ranges to read:  

X-Left:-1, X-Right:1, Y-Near:-1, Y-

Far: 1, Z-Low: -1, Z-High:1, XE: 0, YE:-3, zE:0, 

Step Indep: 10, Depnd: 8

Θ Press @ERASE  @DRAW to draw the three-dimensional surface.   
Θ Press @EDIT!L  @LABEL  @MENU to see the graph with labels and ranges. 

Θ Press LL@)PICT  @CANCL to return to the PLOT WINDOW environment.  
Θ Press  $ , or L@@@OK@@@, to return to normal calculator display.

The VPAR (Volume Parameter) variable contains information regarding the 
“volume” used to produce a three dimensional graph.  Therefore, you will see it 
produced whenever you create a three dimensional plot such as Fast3D, 
Wireframe, or Pr-Surface.

Note: The equations x = x(X,Y), y = y(X,Y), z=z(X,Y) represent a parametric 
description of a surface.  X and Y are the independent parameters.   Most 
textbooks will use (u,v) as the parameters, rather than (X,Y).  Thus, the 
parametric description of a surface is given as x = x(u,v), y = y(u,v), z=z(u,v).