IBM 5100 Apl Reference Manual

84
The 'I' Function: Grade Down (]] CIJ
The 1 symbol is formed by overstriking the Vsymbol and the I symbol.
Monadic (One-Argument) Form: Grade Down 1
The grade down function result Js the index values that would select the elements
of the numeric vector of argument 8 in descending order. That is, the first element
of the result is the index of the largest element in argument 8, the next element is
the index of the next largest element in argument 8, and so on. Argument 8 must
be a numeric vector. When two or more elements in the vector have the same
numeric value, their position in the vector determines their order in the result (the
index value of the first occurrence appears first in the output). The number of
elements in the result is the same as the number of elements in the argument:
~:'5
:I.
~:)
I')
,.-..
1+
3
~)
1
Lf.
11
"M
\f1Af'6
"
5
:l
1+
:3
......
:1.
:5 5
6 2 4·
~:3
6
:3
1-
1::'
,J
2
2
5
:1.
~5 6
LI·
The following example shows how the grade down function can be used to sort a
vector in descending order:
A~14 12 16 18 15 11
f~d:: ~A:I
18 16 15 1Lf. 12 11
The following example shows how equal elements are handled when using the grade
up and grade down functions:
A~M!:;
")
A.. 8
7
:5
If
10 1
2
:5
A
c'
... 1
r)
A •• B
7 3
LI·
:1.0 :I. 2
:3-
Positions 2 and 9 and 5 and 10 are equal.
,A
7
3
1+
1 6
8
B
6 1
1+
:~ 7

IBM 5100 Specifications

General

Brand	IBM
Model	5100
Category	Laptop
Language	English