IBM 5100 Apl Reference Manual

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The? Function: Roll ('71
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Monadic (One-Argument) Form: Roll ?8
The roll function result is a randomly selected integer from 0 through 8-1 or 1
through 8 (depending on the index origin). Each integer in the range has an equal
chance
of being selected. The argument can be a positive integral scalar, vector, or
other array. The shape of the result is the same as that of the argument:
7300
202
?:30 ()
3
?~5 7 9
2 :I.
4·
'?6
6
!5
1.1·
76
6
6
6
If the argument is an array, the function is extended to each element of the array:
B~2 3pl1 22 33 ~4 55 66
B
1.:1. 2~? 33
",.1+ !7.i !:5 6 t')
?B
2 :l7 :1.6
21+ :I.~~ ,+
Dyadic (Two-Argument) Form
See the Deal function later in this chapter under Primitive Mixed Functions.
61

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)