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using WHERE to search for multiple values [message #30408]

Thu, 25 April 2002 15:13

dmartin
Messages: 5
Registered: April 2002

Junior Member

I'm trying to do something like the following:

w=where(im eq val)

with im a byte array (say, 640x480)
and val an array (say, 10 to 40 long)

I want to find where im is equal to _any_ of the values in val. But,
val is not always the same size.

Is there a way to do this using one WHERE call? There seems to be a
giant time difference between:

for i=0,(size(val))[1]-1 do begin
w=where(im eq val(i))
...
endfor

and

w=where(im eq val(0) or val(1) or val(2) or ...)

(but I can't do the above since val has different sizes from call to
call)

Sorry for the run-on nature of this post.

Thanks,
Doug

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[Message index]

		using WHERE to search for multiple values By: dmartin on Thu, 25 April 2002 15:13
		Re: using WHERE to search for multiple values By: R.Bauer on Mon, 29 April 2002 08:13

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