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Section 13: Finding the Roots of an Equation 193

Restriction on the Use of _

The one restriction regarding the use of _ is that _ cannot be

used recursively. That is, you cannot use _ in a subroutine that is

called during the execution of _. If this situation occurs, execution

stops and Error 7 is displayed. It is possible, however, to use _ with

f thereby using the advanced capabilities of both of these keys.

Memory Requirements

_ requires five registers to operate. (Appendix C explains how they

are automatically allocated from memory.) If five unoccupied registers are

not available, _ will not run and Error 10 will be displayed.

A routine that combines _ and f requires 23 registers of space.

For Further Information

In appendix D, Advanced Use of _, additional techniques and

explanations for using _ are presented. These include:

 How _ works.

 Accuracy of the root.

 Interpreting results.

 Finding several roots.

 Limiting estimation time.

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HP 15C Bedienungsanleitung Seite 193