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HP -28S Manual Page 192

Advanced scientific calculator.
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To Maximize Speed:
• Don't put more than a few hundred objects on the stack .
• Don't leave large lists (more than a few hundred objects) on the
stack; store them in user memory.
To Maximize Available Memory:
"
Note
The following procedure clears the stack, recovery data
(COMMAND, UNDO, LAST), the current custom menu
(CUSTOM), and any suspended programs.
1. Purge unwanted variables and directories from user memory.
2. Store in user memory any objects on the stack that you want to
keep.
3. Perform a System Halt
(ION
1m).
The current directory is now HOME.
To Minimize Memory Usage for Array Calculations: Store arrays
in variables and refer to them by name; avoid using them on the
stack. Here's a comprehensive strategy for doing so.
1. Plan in advance how many variables you'll need, including in-
termediate results.
2. Create small arrays of the correct type (real or complex, vector or
matrix), store them in variables, and then use RDM to adjust
their sizes.
3. Perform calculations using the storage arithmetic commands in
the STORE menu.
4. To act on individual elements, use GET, GET!, PUT,
pun
with
the variable's name,
or use algebraic syntax such as
, A (5.,6)'
E'JAL
and' B
(3)'
STO;
don't return the entire ar-
ray to the stack.
20: Memory
191

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