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Section 4: Using HP-41C Functions59
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Function Editing and Correction
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On the HP-41C, you can edit function names before you execute, or even
terminate completely, using . For
example:
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XEQ _ _
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720.000000
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XEQ _ _
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XEQ ENT _
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XEQ EN _
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XEQ ENG _
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XEQ _
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720.000000
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720.0000
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0.0000
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Errors
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If you attempt to execute a function (using XEQ )
whose name does not exist in the calculator, the HP-41C will display
NONEXISTENT. For example, if you
attempt to execute SINE, the
calculator will display NONEXISTENT.
In the HP-41C, the sine function is spelled
SIN.
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Functions that require numeric data can not operate ALPHA characters. If a
function requiring numeric data attempts to execute using ALPHA characters,
the HP-41C displays ALPHA DATA.
A complete listing of all HP-41C error messages and their meaning is given in
appendix E.
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The HP-41C Catalogs
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The HP-41C has three catalogs of functions. One catalog contains all functions
and programs that you have written and stored in program memory. Another
catalog contains all functions that become active when you plug in extensions
to the HP-41C like application modules or other accessories. And the third
catalog contains all of the standard HP-41C functions (this catalog contains
the bulk of functions you will be using).
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