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Re: Variable stride in array indices [message #15460 is a reply to message #15249]

Tue, 18 May 1999 00:00

bowman
Messages: 121
Registered: September 1991

Senior Member

In article <ySg03.87161$A6.43176220@news1.teleport.com>, "DBorland"
<dborland@egi.com> wrote:

> IDL> a[(a[*,2*LINDGEN(3)])[2*LINDGEN(3),*]] = -1
>
> When you do this, the values from above are set to -1
> IDL> print,a
> -1 1 -1 3 -1 5
> 6 7 8 9 10 11
> -1 13 -1 15 -1 17
> 18 19 20 21 22 23
> -1 25 -1 27 -1 29
> 30 31 32 33 34 35

This only works because the original array was created with LINDGEN. It
won't work in the general case.

I still like

a[0:*:2,0:*:2] = -1

for aesthetic reasons alone.

Ken

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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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