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Re: Random convolution ? [message #40090 is a reply to message #40089]

Thu, 08 July 2004 07:50

Emmanuel Christophe is currently offline

Emmanuel Christophe
Messages: 11
Registered: March 2004

Junior Member

David Fanning wrote:
> Emmanuel Christophe writes:
>
>
>> I got a random effect using convolution:
>>
>> ------------------------------------------------------
>> imagetest=indgen(256,256,224)
>> ker=indgen(1,3,5)
>> r1=convol(double(imagetest),double(ker),/edge_truncate)
>> r2=convol(double(imagetest),double(ker),/edge_truncate)
>> r3=convol(double(imagetest),double(ker),/edge_truncate)
>> print, max(abs(r1-r2))
>> print, max(abs(r1-r3))
>> print, max(abs(r2-r3))
>> end
>> ------------------------------------------------------
>>
>> The first time, I got
>> IDL> .GO
>> 85.961538
>> 793.00000
>> 768.00000
>>
>> and the second time:
>> IDL> .GO
>> 793.00000
>> 793.00000
>> 0.0000000
>>
>> And all results should be zero... I suspect a memory effect but how ?
>
>
> Don't know. I get all zeros every time I run this.
>
> Cheers,
>
> David
>

Do you reach the memory limits of your systems ? Or after several tries
? I also have the problem on only one of two system...

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[Message index]

		Re: Random convolution ? By: R.G. Stockwell on Fri, 09 July 2004 08:25
		Re: Random convolution ? By: Emmanuel Christophe on Thu, 08 July 2004 23:03
		Re: Random convolution ? By: Chris[2] on Thu, 08 July 2004 15:30
		Re: Random convolution ? By: K. Bowman on Thu, 08 July 2004 13:28
		Re: Random convolution ? By: R.G. Stockwell on Thu, 08 July 2004 10:21
		Re: Random convolution ? By: David Fanning on Thu, 08 July 2004 08:20
		Re: Random convolution ? By: Emmanuel Christophe on Thu, 08 July 2004 07:50
		Re: Random convolution ? By: David Fanning on Thu, 08 July 2004 07:30

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