Make sure that the menu for the variables is in the display. (The equation itself should not be in the display. If it is, press .) Pressing @cnow sets NEXT; OLD, A%, B%, and C% to zero.
Variables are also cleared when their equation is edited.
If the SOLVE menu is displayed (rather than the SOLVE CALC
menu), then pressing @c will prompt Note . Press , otherwise you will lose the variables in all the equations. (See “Deleting All Equations or
Variables in the Solver,” page 164.)
Deleting Variables and Equations
Each equation in the Solver list uses calculator memory to store 1) itself, and 2) its variables.*
Deleting a variable is quite different from clearing it:
Clearing a variable sets it to zero; the variable retains its storage location in memory. This does not save memory space.
Deleting a variable erases its value and its storage location. This is a way to save memory space. If a variable is shared, its value is lost to all equations that share it. The memory space for a deleted variable is
*An equation that has not been verified ( pressed) does not have any variables allocated to it. Therefore, it has no variables to be cleared or deleted.
12:The Equation Solver 163
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