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RPN Power 48 manual · Chapter 8 of 19

Variables and the VAR menu

Store, recall, evaluate and purge named variables, and use the VAR menu soft keys.

8.1Names#

A name is an object between single quotes, such as 'x'. Names can hold letters and digits and must start with a letter. Press ', lock alpha, type the name, unlock alpha and press ENTER. A name that holds no value stays on the stack as a name; one that holds a value is replaced by the value when evaluated.

Example 8.1

Put a name on the stack

  1. Quote, alpha lock, x, alpha, ENTER.

    'αα◀1/x÷αENTER
Result of the example "Put a name on the stack" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 'x'.
You should see1: 'x'

8.2Store a value in a variable#

Put the value on level 2 and the name on level 1, then press STO▶. The stack is emptied of both. To get the value back, put the name on the stack and press left shift STO▶ (RCL), or just press the variable's soft key in the VAR menu.

  1. value
  2. ENTER
  3. name in quotes
  4. ENTER
  5. STO▶
Storing a value
Example 8.2

Store 7 in a variable called a

  1. Type 7, enter the name, press STO. Open VAR to see the new variable.

    7'αα◀F1αENTERSTO▶VAR
    After step 1: Type 7, enter the name, press STO. Open VAR to see the new variable. The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: / a .
Result of the example "Store 7 in a variable called a" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: / a .
You should seea
Example 8.3

Recall it with RCL

  1. Store 7 in a.

    7'αα◀F1αENTERSTO▶

  2. Enter the name and press left shift STO (RCL).

    'αα◀F1αENTER◀RCLSTO▶
Result of the example "Recall it with RCL" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 7 / a .
You should see1: 7
Example 8.4

Recall it with the VAR menu

  1. Store 5 in a, open VAR and press the variable soft key.

    5'αα◀F1αENTERSTO▶VARF1
Result of the example "Recall it with the VAR menu" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 5 / a .
You should see1: 5
Example 8.5

Use a variable in a calculation

  1. Store 2 in a, then compute a + 5 by evaluating the expression.

    2'αα◀F1αENTERSTO▶'αα◀F1α+5ENTEREVAL
Result of the example "Use a variable in a calculation" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 7 / a .
You should see1: 7

8.3Use the VAR menu#

VAR lists your variables with the newest first, six at a time. The soft key of a variable runs or recalls it: a number or object is pushed, a program is run, a name is evaluated. Left shift plus the soft key stores level 1 into that variable; right shift plus the soft key recalls the variable.

Example 8.6

Two variables in the menu

  1. Store 7 in a and 8 in b, then open VAR.

    7'αα◀F1αENTERSTO▶8'αα◀F2αENTERSTO▶VAR
Result of the example "Two variables in the menu" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: / b a .
You should seeb a
Example 8.7

Store into a variable with left shift

  1. Store 5 in a. Put 9 on the stack, then left shift plus the soft key stores it.

    5'αα◀F1αENTERSTO▶9ENTERVAR◀F1VARF1
Result of the example "Store into a variable with left shift" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: 9 / a .
You should see1: 9

8.4Delete a variable#

Put the name on the stack and press right shift STO▶ (PURGE). The variable is removed.

Example 8.8

Purge a variable

  1. Store 7 in a, then purge it.

    7'αα◀F1αENTERSTO▶'αα◀F1αENTER▶PURGESTO▶

  2. Open the VAR menu: it is empty.

    VAR
Result of the example "Purge a variable" The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1:.
You should see1:
Example 8.9

Recalling a missing variable

  1. Try to recall a name that holds nothing.

    'αα◀ASINSINαENTER◀RCLSTO▶
Result of the example "Recalling a missing variable" The display shows: RAD { HOME } / RCL Error: / Undefined Name / 4: / 3: / 2: / 1: 'q'.
You should seeUndefined Name

8.5The TOOL menu#

TOOL gathers EDIT, VIEW, RCL, STO, PURGE and CLEAR. EDIT and VIEW open level 1 in the command line.

The TOOL menu. The display shows: RAD { HOME } / 6: / 5: / 4: / 3: / 2: / 1: / EDIT VIEW RCL STO PURGE CLEAR.
The TOOL menu.

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