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Re: RMS of background [message #50465]

Fri, 29 September 2006 11:08

adisn123
Messages: 44
Registered: July 2006

Member

Thanks to all.

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Re: RMS of background [message #50466 is a reply to message #50465]

Fri, 29 September 2006 10:41

Jean H.
Messages: 472
Registered: July 2006

Senior Member

> square = image ^ 2

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Re: RMS of background [message #50467 is a reply to message #50466]

Fri, 29 September 2006 10:40

Jean H.
Messages: 472
Registered: July 2006

Senior Member

adisn123@yahoo.com wrote:
> I have a sky background image and want to find what rms of the
> background is.
> Do I want to
> 1) square all pixel values of each point in the 2d image
> 2) add them and divide by the total number of points
> 3) take a square root of that?
>

you should read the help file about arrays...

square = image^2
total = total(square)
nbPixels = n_elements(image)
sqrt = sqrt(float(total) / nbPixels)

Jean H.

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Re: RMS of background [message #50469 is a reply to message #50467]

Fri, 29 September 2006 10:42

greg michael
Messages: 163
Registered: January 2006

Senior Member

How do you know you want to find the rms? Otherwise, sounds fine to me.

adisn123@yahoo.com wrote:
> I have a sky background image and want to find what rms of the
> background is.
> Do I want to
> 1) square all pixel values of each point in the 2d image
> 2) add them and divide by the total number of points
> 3) take a square root of that?

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