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Re: How can i get the co-ordinates of the peaks in a plot? [message #50333 is a reply to message #50332]

Mon, 25 September 2006 02:10

Tigran Khanzadyan
Messages: 5
Registered: September 2006

Junior Member

zircola wrote:
> I used max function to get the y value but don't know how to get the
> corresponding x value and how to get the xy value of the more than one
> peaks. please help. thanks:)

Hi,

I can quickly answer to your first question:

sizeim=size(image)
szx=sizeim(1)*1.
szy=sizeim(2)*1.
inx=where(image eq max(image))
xv=round((inx/szx-fix(inx/szx))*szx)
xv=xv(0)
yv=fix(inx/szx)
yv=yv(0)

xx=findgen(szx)-xv
yy=findgen(szy)-yv
xx=xx*(image pixel scale)*(-1.) ; for correct RA direction
yy=yy*(image pixel scale)

You can use this coordinates to make a plot with 0 on maximum value.
For more peaks, maybe you can overplot contours and show that way
some of your peaks.

I hope this can solve some of your problems.

Cheers

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[Message index]

		Re: How can i get the co-ordinates of the peaks in a plot? By: Paul Van Delst[1] on Mon, 25 September 2006 13:29
		Re: How can i get the co-ordinates of the peaks in a plot? By: Braedley on Mon, 25 September 2006 05:05
		Re: How can i get the co-ordinates of the peaks in a plot? By: Tigran Khanzadyan on Mon, 25 September 2006 02:10
		Re: How can i get the co-ordinates of the peaks in a plot? By: zircola on Thu, 28 September 2006 17:45

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