This is the program:

« '1/3*π*H^2*(3*R-H)' →NUM »

Now use SPH to calculate the volume of a spherical cap of radius r = 10 and height h = 3.

First, store the data in the appropriate variables. Then select the VAR menu and execute the program. The answer is returned to level 1 of the stack.

10 OR K

3 OH K

J%SPH%

Viewing and Editing Programs

You view and edit programs the same way you view and edit other objects — using the command line.

To view or edit a program:

1.View the program:

If the program is in level 1, press ˜ (or use the EDIT command).

If the program is stored in a variable, use the Filer (!¡) to select the variable and press @EDIT! (‘), or press J, then @and the variable’s menu key (a shortcut to recall a variable’s contents to level 1), followed by ˜. Alternatively, with the variable name in level 1 press „˜ (or use the EDITB, VISIT or VISITB command).

2.Optional: Make changes.

3.Press `to save any changes (or press −to discard changes) and return to the stack, or to Filer if you used Filer to select the program.

Filer lets you change a stored program without having to do a store operation. From the stack you can change a program and then store the new version in a different variable.

While you’re editing a program, you may want to switch the command-line entry mode between Program-entry mode (for editing most objects) and Algebraic/Program-entry mode (for editing algebraic objects). The PRG and ALG annunciators indicate the current mode.

To switch between entry modes:

Press @Í.

Example: Edit SPH from the previous example so that it stores the number from level 1 into variable H and the number from level 2 into variable R.

Select SPH from the soft keys.

J

@%SPH% ˜

Move the cursor past the first program delimiter and insert the new program steps.

™OH ™K OR ™K

1-6 RPL Programming