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Variable stride in array indices [message #15249]

Fri, 07 May 1999 00:00

bowman
Messages: 121
Registered: September 1991

Senior Member

We haven't had a good argument about IDL syntax lately, so I thought I
would ask why IDL does not allow variable stride in array indices. For
example, if

zz = z[0:5:2]

then zz would contain [z[0], z[2], z[4]].

I realize that this kind of thing can be done with array subscript lists
such as z[[0, 2, 4]], but this can be awkward for multidimensional
arrays. It is also necessary to *store* the lists of subscripts, and I
believe that implementation through indirect subscripts must be slower
than implementing strides through direct iteration (i.e., internal
compiled DO loops).

Any comments?

Ken Bowman

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[Message index]

		Variable stride in array indices By: bowman on Fri, 07 May 1999 00:00
		Re: Variable stride in array indices By: DBorland on Tue, 18 May 1999 00:00
		Re: Variable stride in array indices By: bowman on Tue, 18 May 1999 00:00
		Re: Variable stride in array indices By: bowman on Tue, 18 May 1999 00:00

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