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Re: partial differential equation [message #93982 is a reply to message #93980]

Tue, 13 December 2016 07:24

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Tuesday, December 13, 2016 at 3:49:42 AM UTC-5, AGW wrote:
> Hi,
>
> If
> lm=[623.2,624.5,665.3,778.2]
> S=ss[0:300,0:400,0:18,0] ;;; an image
> compute
>
> x=∑[(∂^2 (s))/(∂(lm)^2)] ;;; image
>
> How can I do it using IDL?

So S has 19 slices but lm only has 4 elements? How is that supposed to work? You can check out Wikipedia's article on finite differences.

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[Message index]

		partial differential equation By: Ali Gamal on Tue, 13 December 2016 00:49
		Re: partial differential equation By: Craig Markwardt on Tue, 13 December 2016 07:24
		Re: partial differential equation By: Ali Gamal on Tue, 13 December 2016 09:18
		Re: partial differential equation By: Craig Markwardt on Tue, 13 December 2016 09:35
		Re: partial differential equation By: Ali Gamal on Tue, 13 December 2016 09:50

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