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Re: Manipulation using where [message #53188 is a reply to message #53099]

Thu, 22 March 2007 01:26

wxf
Messages: 6
Registered: March 2007

Junior Member

Somebody above use "mod-method".That is correct.

I often use "array_indices" function to change the result of "where"
into two dimensional coordinates.It's ok,but I never tried 3-D case.

IDL> dat=dist(400,300) ; a data array
IDL> index=where (dat eq 100)
IDL> ind = array_indices(dat,index)
IDL> xarray=ind(0,*) ; get X
IDL> yarray=ind(1,*) ; get Y
IDL> tvscl, dat ; show image
IDL> plots, xarray, yarray, psym=2, color=150,/dev ;over plot the
points
If you want to change (x,y) into one dimensional coordinate('where()'-
result),you can use this formula.
;your image size-(m,n),any coordinates(x,y)
;position=mL*long(round(y))+long(round(x))

You see,it is not difficult.3-D's case and formula can be available
just do the same thing.
Good luck
wxf

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[Message index]

		Re: Manipulation using where By: David Fanning on Wed, 21 March 2007 08:52
		Re: Manipulation using where By: Vidhya on Wed, 21 March 2007 07:41
		Re: Manipulation using where By: David Fanning on Wed, 21 March 2007 08:19
		Re: Manipulation using where By: Vince Hradil on Wed, 21 March 2007 07:16
		Re: Manipulation using where By: wxf on Thu, 22 March 2007 01:26

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