2-18 RPL Programming Examples
!²
12 `56 `˜šš
45 `1 `
9 `14 `
`
Select the VAR menu and execute MNX.
J %MNX%
Find the maximum element.
%MAX%
MNX2 (Minimum or Maximum Element- Version 2)
Given an array on the stack, MNX2 finds the minimum or maximum element in the array. MNX2 uses a
different approach than MNX: it executes OBJ" to break the array into individual elements on the stack for
testing, rather than executing GETI to index through the array.
Level 1 " Level2 Level 1
[[ array ]]
"
[[ array ]] Z
max
or Z
min
Techniques used in MNX2
! FOR…NEXT (definite loop). The initial counter value is 1. The final counter value is nm –1, where nm is
the number of elements in the array. The loop-clause contains the sort instructions.
! User flag for logic control. User flag 10 defines the sort: When flag 10 is set, MNX2 finds the maximum
element; when flag 10 is clear, it finds the minimum element. You determine the status of flag 10 at the
beginning of the program.
! Nested conditional. An IF…THEN…END conditional is nested in the FOR…NEXT loop, 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.
! Logical function. MNX2 executes XOR (exclusive OR) to test the combined state of the relative value of
the two elements and the status of flag 10.
! Custom menu. MNX2 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.
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