IDL transpose: perfusion arrays

Examples

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See Additional Examples for more information on using TRANSPOSE.

Example 1

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

IDL prints:

A:

   0  1  2

   3  4  5

   6  7  8

Transpose of A:

   0  3  6

   1  4  7

   2  5  8

Syntax

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Result = TRANSPOSE( Array [, P] )

Return Value

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Returns the reflection of the array along a diagonal.

Arguments

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Array

The array to be transposed.

P

A vector specifying how the dimensions of Array will be permuted. The elements of P correspond to the dimensions ofArray; 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.

Keywords

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None.

Additional Examples

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Example 2

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

IDL prints:

A   INT  = Array[2, 3, 4]

B   INT  = Array[4, 3, 2]

C   INT  = Array[3, 4, 2]