Re: Strange memory problem

[rivers(at)cars3.uchicago.edu (Mark Rivers)]

In article <83rfkn$826$1@nnrp1.deja.com>, Peter Mason <menakkis@my-deja.com> writes:
>rkj@dukebar.crml.uab.edu (R. Kyle Justice) wrote:
><...>
>> Actually I should have given my real problem rather than a
>> simplified version of it.  Acutally I have two big arrays of
>> equal size and I am trying to copy one into the other:
>>
>> temp1(*)=temp2
><...>
>
>The best way I know of to do this sort of thing (in IDL) is to use
>array-insertion starting offsets.
>e.g., If you have 2-dimensional arrays and you want to copy one on top
>of another, do:  TEMP1(0,0)=TEMP2.
>This is much, *much* more efficient than using '*'.   It also converts
>what it copies to the datatype of TEMP1 if necessary.
>This issue goes back a long way, so I'd expect the "solution" to work
>on PV-Wave as well.

This is definitely the best way to do this.  Note that you don't need both
subscripts.  You can just say:
a = bytarr(100,100,25)+10b  ; Create array of all 10's
b = bytarr(100,100,25)       ; Create a zero filled array
b(0) = a  ; This copies a into b


Mark Rivers