HP 50g User's Reference Manual
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Brand: HP
Category: Calculator
Type: Advanced user's reference manual
Model: HP 48gII , HP 49g+ , HP 50G
Pages: 693
2-16 RPL Programming Examples
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4
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Y+Z
™
+
! Ü
8
*
X -5
*
Z
™Q2
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Select the VAR menu and start the program.
J
%EXCO%
Minimum and Maximum Array Elements
This section contains two programs that find the minimum or maximum element of an array:
MNX uses a DO…UNTIL…END (indefinite) loop.
MNX2 uses a FOR…NEXT (definite) loop.
MNX (Minimum or Maximum Element—Version 1)
MNX finds the minimum or maximum element of an array on the stack.
Level 1
→
Level2 Level 1
[[ array ]]
→
[[ array ]] Z
min
or Z
max
Techniques used in MNX
DO…UNTIL…END (indefinite loop). The DO clause contains the sort instructions. The UNTIL clause
contains the system-flag test that determines whether to repeat the sort instructions.
User and system flags for logic control:
User flag 10 defines the sort: When flag 10 is set, MNX finds the maximum element; when flag 10 is clear, it
finds the minimum element. You determine the state of flag 10 at the beginning of the program.
System flag
–
64, the Index Wrap Indicator flag, determines when to end the sort. While flag
–
64 is clear, the sort
loop continues. When the index invoked by GETI wraps back to the first array element, flag
–
64 is automatically
set, and the sort loop ends.
Nested conditional. An IF…THEN…END conditional is nested in the DO…UNTIL…END conditional,
and determines the following:
Whether to maintain the current minimum or maximum element, or make the current element the new
minimum or maximum.
The sense of the comparison of elements (either < or >) based on the status of flag 10.
Custom menu. MNX builds a custom menu that lets you choose whether to sort for the minimum or maximum
element. Key 1, labeled
%MAX%
, sets flag 10. Key 2, labeled
%MIN%
, clears flag 10.
Logical function. MNX executes XOR (exclusive OR) to test the combined state of the relative value of the two
elements and the status of flag 10.