IBM 5100 Apl Reference Manual

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Finding the Shape of An Array
Once you have generated an array, you can find its shape (number of elements in
each coordinate) by specifying p (shape function) with only a right argument which
is the name of the array. If A is a vector with six elements and you enter pA, the re-
sult is one number because A is a one-dimensional array. The number is 6, the
length (number
of elements) of A's one dimension. The result of the shape function
is always a vector:
A~111 222 333 444 555 666
~) (.1
The shape of a matrix or N-rank array is found the same way:
123
M~2 3p1 2 3 1+ 5 6
M
'+ 5 6
~)M
2 3
'i
.:..
R~2 3 4pi 2 3 1+ 5 6 7 B
R
12~3ll·
~5 6 ·7 B
1 2 3 Lt·
~5
6 "7 B
1
2
3
Lt·
~.)
t)
"7 B
pR
3 4
I n some cases, it might be necessary to know just the rank, the number of coordi-
nates (or
indice~) of an array. The rank can be found by entering pp (shape of the
shape) and a right argument, which is the name of the array:
Ai-lll
222 ~5~53
4'+'+
Bf·2
3p1
2
3
'+
~i 6
Ci-2
~3
I.~~) 1
:~ 3
,+
~)
(jA
6
ppA
1
pH
2 3
p(jB
2
pC
2
3
1+
ppC
3
35

IBM 5100 Specifications

General

Release Year	1975
RAM	16 KB - 64 KB
Storage	204 KB tape drive
Display	5-inch CRT
Operating System	APL/BASIC
Processor	IBM PALM (1.9 MHz)