Dyadic (Two-Argument) Form: Generalized Transpose AQB
94
The generalized transpose function interchanges the coordinates of argument B as
specified by argument A. Argument B can be any expression. Argument A must
be a vector or a scalar, and must have an element for each coordinate of argument B;
also, argument A must contain all the integers between 1 and the largest integer
specified. For example, to transpose the rows and columns of a matrix, argument A
would be 2 1:
To transpose the rows and columns of a 3-rank (three-coordinate) array, argument A
would be 1 3 2:
1.3
:I. 7
2 1.
E 4.. 2 3 14. p 1 2 14.
B
An array with two planes, three rows, and four columns.
The second and third coordinates have been interchanged,.
I
2 3 14.
6 ‘7 I3
1. 0 1. :I. 1.2
:I. 1.1 :I. f :I. 0
1 f3 1. 9 2 0
22 23 ;y.1.
:I. ;3 :?&I{
5 9
ci 1 0
7 1. 1.
13 1.2
forming an array with two planes, four rows, and three
1.3 1 ‘7 2 :I. columns.
:I. 4. :LEI 2 2

El
The ? Function: Deal
Monadic (One-Argument) Form
See the Roll function earlier in this chapter under Primitive Scalar Functions.
Dyadic (Two-Argument) Form: Deal A?B
The deal function randomly selects numbers from 0 through B-I or 1 through B
(depending on the index origin), without selecting the same number twice. Both
arguments must be single positive integers. Argument A must be less than or equal
to argument B; argument A determines how many numbers are selected.