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Matrix/

extrac2.pro

extraction of subdomains of matrices; Even if the subdomain is "pierced" (see the example) By default, IDL can make extractions of subdomain: IDL> a=indgen(5,5) IDL> print, a 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 IDL> print, a[[0,2],3] 15 17 IDL> print, a[[0,2],*] 0 2 5 7 10 12 15 17 20 22 but IDL> print, a[[0,2],[3,4]] 15 22 while IDL> print, extrac2(a,[0,2],[3,4]) 15 17 20 22

extrac2 Utilities

result = extrac2(array, index1, index2, index3, index4)

Return value

a matrix 1,2,3 or 4d extract from input array

Parameters

array        in required

a 1,2,3 or 4 dim input array

index1        in required

can have 2 forms: 1)a vector containing indexes of lines we want to keep 2)the string '*' if we want to keep all lines.

index2        in required

the same thing that index1 but for dim 2.

index3        in required

the same thing that index1 but for dim 3.

index4        in required

the same thing that index1 but for dim 4.

Examples

I have a dim 2 matrix named A. I want extract a small intersection matrix 2d of the line 2,3 and 7 and of the column 0 and 1: IDL> res=extrac2(A,[2,3,7],[0,1]) other ex: IDL> print, a a b c d e f g h i IDL> print, extrac2(a,[0,2],[0,2]) a c g i

Version history

Version

$Id: extrac2.pro 163 2006-08-29 12:59:46Z navarro $

History

Sebastien Masson (smasson@lodyc.jussieu.fr) 12/1/1999 29/4/1999: correction of a bug and complement of the heading

Known issues

Restrictions

-1 in case of mistake

 


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