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Re: realizing the formula in idl [message #45400 is a reply to message #45399]

Fri, 09 September 2005 07:14

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

pravesh.subramanian@gmail.com wrote:
> Hello,
> How do I realize this formula in IDL?
>
> matrix(x, y) = 1/(s^2 * 2 * pi) * Exp (-(x^2 + y^2)/2 * s^2)
>
> let's say x = y = 300

The other people who've responded have assumed that what you mean is
that matrix is a 300x300 array, and that you want to fill in the entire
array. That seems likely, but there's an alternative interpretation of
your message, for which the answer is different. If you merely want to
set one element of the array to this value, then what you've already
written is almost exactly the correct IDL translation:

matrix[x, y] = 1/(s^2 * 2 * !dpi) * Exp (-(x^2 + y^2)/2 * s^2)

Even the use of the square brackets "[]" isn't strictly necessary, I
just think it's clearer.

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[Message index]

		Re: realizing the formula in idl By: pravesh.subramanian on Fri, 09 September 2005 07:44
		Re: realizing the formula in idl By: James Kuyper on Fri, 09 September 2005 07:14
		Re: realizing the formula in idl By: Craig Markwardt on Fri, 09 September 2005 00:57
		Re: realizing the formula in idl By: Timm Weitkamp on Fri, 09 September 2005 01:40

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