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Classic Graphing 84 manual · Chapter 7 of 25

Variables and memory

Store numbers in letters, recall them, use stored values in calculations, and clear entries, lists or all memory.

7.1Store a value in a variable#

Type a value or calculation, press sto→ (the arrow →), then a letter key, then enter. The letters are in green above the keys; press alpha first. The calculator has 26 letter variables A to Z, plus θ. An untouched variable is 0.

  1. Type 5
  2. sto→
  3. alphaAmath
  4. enter
Store a number in A
Example 7.1

Store and use a variable

  1. Store 5 in A.

    5sto→alphaAmathenter

  2. Calculate A².

    alphaAmathx²enter
Result of the example "Store and use a variable" The display shows: 5→A / 5 / A² / 25.
You should see5→A A² 25
Example 7.2

Store a calculated value

  1. Store 3/4 in B.

    3÷4sto→alphaBappsenter
Result of the example "Store a calculated value" The display shows: 3/4→B / .75.
You should see3/4→B .75
Example 7.3

Variables multiply side by side

  1. Store 2 in A and 3 in B.

    2sto→alphaAmathenter3sto→alphaBappsenter

  2. Calculate AB + A.

    alphaAmathalphaBapps+alphaAmathenter
Result of the example "Variables multiply side by side" The display shows: 2→A / 2 / 3→B / 3 / AB+A / 8.
You should seeAB+A 8
Example 7.4

An untouched variable is zero

  1. Calculate Q + 1.

    alphaQ9+1enter
Result of the example "An untouched variable is zero" The display shows: Q+1 / 1.
You should seeQ+1 1

7.2Recall a stored value#

Just type the letter to use a variable in a calculation. To see or paste the stored value itself, press 2ndRCLsto→ (RCL), then the letter, then enter. RCL also pastes lists, matrices, strings and Y= functions.

Example 7.5

Paste the value of C

  1. Store 12.5 in C.

    12.5sto→alphaCprgmenter

  2. Press 2nd sto, then alpha and the prgm key for C, then enter. The number 12.5 is typed into the entry line.

    2ndRCLsto→alphaCprgmenter
Result of the example "Paste the value of C" The display shows: 12.5→C / 12.5 / 12.5.
You should see12.5

7.3Store a list and use its items#

Example 7.6

Store a list in L1

  1. Type {4,5,6}, store it in L1 (2nd then the 1 key).

    2nd{(4,5,62nd})sto→2ndL11enter

  2. Read the second item with L1(2).

    2ndL11(2)enter
Result of the example "Store a list in L1" The display shows: {4,5,6}→L1 / {4 5 6} / L1(2) / 5.
You should see{4 5 6} L1(2) 5

See also Lists

7.4Ans and ENTRY#

Ans holds the last answer, and ENTRY (2ndENTRYenter) brings back the last entry. See the calculations chapter for both.

See also Calculations on the home screen: Use the last answer (Ans)Calculations on the home screen: Repeat or recall an entry

7.5Clear entries, lists or all memory#

Press 2ndMEM+ for the MEMORY menu.

The MEMORY menu. The display shows: MEMORY / 1:About / 3:Clear Entries / 4:ClrAllLists / 7:Reset….
The MEMORY menu.
ItemWhat it does
1: AboutShows the name of this calculator.
3: Clear EntriesForgets the saved entries, so 2ndENTRYenter has nothing to bring back.
4: ClrAllListsEmpties every list.
7: Reset…Opens RESET RAM: choose 1 No or 2 Reset. Reset erases everything: variables, lists, matrices, Y= functions, programs, windows and all settings.
Example 7.7

Clear the saved entries

  1. Calculate 1 + 1.

    1+1enter

  2. Press 2nd add, then 3.

    2ndMEM+3
Result of the example "Clear the saved entries" The display shows: 1+1 / 2 / Clear Entries / Done.
You should seeClear Entries Done
Example 7.8

Reset all memory

  1. Store 5 in A.

    5sto→alphaAmathenter

  2. Press 2nd add, 7, move down to Reset and press enter.

    2ndMEM+7▼enter
Result of the example "Reset all memory" The display shows: RAM cleared.
You should seeRAM cleared

TI-84 Plus CE is a trademark of Texas Instruments Incorporated. Trident Calculator is an independent product by South View Studios and is not affiliated with, sponsored by or endorsed by Texas Instruments. The name is used only to describe the kind of calculator this model resembles; Trident's names, keys, display, fonts and software are its own clean-room design.