TRANSPOSE Function
Transposes the input array.
enabled.
 
note
This operation performs best when the system variable !CACHE accurately reflects cache sizes on the host machine.
Usage
result = TRANSPOSE(array)
Input Parameters
array—The array to be transposed. The input array can have any number of dimensions.
Returned Value
result—The transposed array.
Keywords
Dimension—A vector of two integers (n 0) designating the dimensions to transpose. Default: [0,1]
Discussion
TRANSPOSE is used to interchange two dimensions of an array, most commonly the rows and columns of a matrix. For vectors and co-vectors, TRANSPOSE can be used to change from one to the other, but it is more efficient to use REFORM for this purpose.
Example 1
a = INDGEN(2,3)
PM, a
; PV-WAVE prints the following:
;   0       2       4
;   1       3       5
PM, TRANSPOSE(a)
; PV-WAVE prints the following:
;   0       1
;   2       3
;   4       5
Example 2
OPENR, lun, !Dir + '/demo/gallery3/data/aerial_demo.img', /Get_lun
aerial_img = BYTARR(512,512)
READU, lun, aerial_img
FREE_LUN, lun
WINDOW, Xsize=512, Ysize=512, /Free, Title='Original Image'
TVSCL, aerial_img
WINDOW, Xsize=512, Ysize=512, /Free, Title='Transposed Image'
TVSCL, TRANSPOSE(aerial_img)
Figure 17-1: Transposed Image shows what an aerial image looks like before and after applying TRANSPOSE.
 
Figure 17-1: Transposed Image
 
Example 3
a = INDGEN(2, 4, 3)
PM, a
; PV-WAVE prints the following:
; 0       2       4       6
; 1       3       5       7
 
; 8      10      12      14
; 9      11      13      15
; 16      18      20      22
; 17      19      21      23
 
PM, TRANSPOSE(a, Dimension=[0,2])
; PV-WAVE prints the following:
; 0       2       4       6
; 8       10      12      14
; 16      18      20      22
 
; 1       3       5       7
; 9       11      13      15
; 17      19      21      23
See Also