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Section 12: Subroutines 189
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Σ–
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yx
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x2
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10x
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ex
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Σ+
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1/x
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√x
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LOG
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LN
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A
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B
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C
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D
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E
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When you press Σ+ in USER mode, the HP-41C first searches
for LBL A within the current program.
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If there is no LBL A in the current program, the
calculator executes the Σ+ function. Remember, the
calculator searches only the current program for the local label, it does not
search all of program memory.
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If there is a LBL A in the current program,
execution begins at that point. Using local labels requires the calculator to be
set to the portion of program memory containing the local label prior to
running the program.
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When you reassign any other function to the top row locations for execution
in USER mode, the local label search is not performed for that particular reassigned
location.
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Example: The following program, named SPEED, computes distance (given rate and
time), rate (given distance and time), or time (given distance and rate). While in
USER mode, you press A when you wish to compute a distance, B when you wish to compute
a rate, and C when you wish to compute a time. The program prompts you for the
required data. Since you assigned PROMPT to
Σ+ for USER mode operation earlier in this section,
simply press Σ+ in USER mode when you wish to load
a PROMPT .
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Execution of the normal functions on the top rows of keys in USER mode
may take several seconds. The calculator must first search through the current
program for the local label associated with that key. If no local label is found,
the normal mode function is then executed. This is only true when no other function
has been assigned to that key for USER execution. To shorten this search time,
press
g
GTO ·
· .
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