|IDL Reference Guide: Procedures and Functions|
The TRANSPOSE function returns the transpose of Array. If an optional permutation vector is provided, the dimensions of Array are rearranged as well.
Result = TRANSPOSE( Array [, P] )
Returns the reflection of the array along a diagonal.
The array to be transposed.
A vector specifying how the dimensions of Array will be permuted. The elements of P correspond to the dimensions of Array; the ith dimension of the output array is dimension P[i] of the input array. Each element of the vector P must be unique. Dimensions start at zero and can not be repeated.
If P is not present, the order of the dimensions of Array is reversed.
Also see Transposing Images for a more extensive example.
Print a simple array and its transpose by entering:
; Create an array: A = INDGEN(3,3) TRANSA = TRANSPOSE(A) ; Print the array and its transpose: PRINT, 'A:' PRINT, A PRINT, 'Transpose of A:' PRINT, TRANSA
A: 0 1 2 3 4 5 6 7 8 Transpose of A: 0 3 6 1 4 7 2 5 8
This example demonstrates multi-dimensional transposition:
; Create the array: A = INDGEN(2, 3, 4) ; Take the transpose, reversing the order of the indices: B = TRANSPOSE(A) ; Re-order the dimensions of A, so that the second dimension ; becomes the first, the third becomes the second, and the first ; becomes the third: C = TRANSPOSE(A, [1, 2, 0]) ; View the sizes of the three arrays: HELP, A, B, C