Using The Solver To Repeat A Calculation - HP -28S Manual

Advanced scientific calculator.

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Check the current path.
PATH
I
ENTER
I
3:
2:
1:
{ HOME EE SP1 )
------
You can find any variable in the HOME or EE directories by name,
because those directories are on the current path (HOME EE SPI), but
the USER menu shows only the variables in the current directory
(SPI).
Now you're ready to use the Solver with the expression EQI.
Using the Solver To Repeat a Calculation
There are three basic steps to using the Solver with an expression.
1. Store the expression (or the name of the expression) in a variable
named EQ
(equation).
The Solver requires a variable by this
name.
2. Use the Solver menu to assign values to the variables.
3. Use the Solver to evaluate the expression.
4. Repeat steps 2 and 3 for other values.
Here are the steps for the present example.
Step 1.
Store the name EQI in a variable EQ.
This step may surprise you-why store a name in a variable? Why not
store the expression itself in EQ? The simplest reason is that the name
EQI is shorter and easier to remember than the entire expression.
Also, you'll see later that this makes it easy to switch back and forth
between different equations.
Put the name EQI on the stack.
CJ
EQ1
I
ENTER
I
3:
2:
{ HOME EE SP1 )
1:
'EQ1'
------
If you forgot the quote
CJ,
you got the expression itself on the stack;
in this case press
I
DROP
I
to drop the expression and try again.
4: Repeating Calculations
63

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