Input/Output:

Level 1/Argument 1Level 1/Item 1

x

→

 

0

→

xkey

–1

→

xkey

Example 1:

This program:

 

 

« "Press [1] to addPress any other key to subtract"

 

1 DISP 0 WAIT IF 92.1 SAME THEN + ELSE - END »

 

displays a prompting message and halts program execution until a key is pressed. If the 1key

 

(location 92.1) is pressed, two numbers on the stack are added. If any other key is pressed, two

 

numbers on the stack are subtracted.

Example 2:

This program:

 

« { ADD { } { } { } { } SUB } MENU

 

"Press [ADD] to addPress [SUB] to subtract"

 

1 DISP -1 WAIT IF 11.1 SAME THEN + ELSE - END »

 

builds a custom menu with labels ADD and SUB and a prompting message. Executing -1 WAIT

 

displays the custom menu (note that it’s not active) and suspends execution for keyboard input. If

 

the ADD menu key (location 11.1) is pressed, two numbers on the stack are added. If any other

 

key is pressed, two numbers on the stack are subtracted.

See also:

KEY

 

 

 

WHILE

Type: Command Operation

Description: WHILE Indefinite Loop Structure Command: Starts the WHILE … REPEAT … END indefinite loop structure.

WHILE … REPEAT … END repeatedly evaluates a test and executes a loop clause if the test is true. Since the test clause occurs before the loop-clause, the loop clause is never executed if the test is initially false. The syntax is this:

WHILE test-clause REPEAT loop-clause END

The test clause is executed and must return a test result to the stack. REPEAT takes the value from the stack. If the value is not zero, execution continues with the loop clause; otherwise, execution resumes following END.

Access:

!°BRANCH WHILE

( °is the left-shift of the Nkey).

Input/Output:

 

 

 

 

 

 

 

 

 

 

Level 1/Argument 1

Level 1/Item 1

 

 

 

 

 

 

 

WHILE

 

→

 

 

REPEAT

 

T/F →

 

 

END

 

→

 

DO, END,

 

 

 

See also:

REPEAT

 

 

 

 

 

 

 

WIREFRAME

Command

 

 

Type:

 

 

Description: WIREFRAME Plot Type Command: Sets the plot type to WIREFRAME.

When the plot type is set to WIREFRAME, the DRAW command plots a perspective view of the graph of a scalar function of two variables. WIREFRAME requires values in the reserved variables EQ, VPAR, and PPAR.

Full Command and Function Reference 3-273