comp.lang.idl-pvwave archive: archive » Re: how many array elements with a certain value in a row

Home » Public Forums » archive » Re: how many array elements with a certain value in a row

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: how many array elements with a certain value in a row [message #70272 is a reply to message #70271]

Thu, 01 April 2010 06:48

Chris W
Messages: 12
Registered: May 2007

Junior Member

On Apr 1, 7:49 am, Jeremy Bailin <astroco...@gmail.com> wrote:
> Does anyone have a nice simple efficient solution to this problem (I
> have a simple inefficient solution and a vague sketch in my mind of a
> convoluted but probably efficient solution):
>
> I have an image in which many pixels are saturated (=65535, they're
> short unsigned). I want to treat each set of consecutive saturated
> pixels in a row as a single unit and know how many saturated pixels in
> a row there are. So I would like to have a list that contains (a) the
> rightmost pixel of each set of consecutive saturated pixels, and (b)
> how many saturated pixels there were in the set.
>
> Any suggestions?
>
> -Jeremy.

create an array the same size as the image, with values equal to the x
index ([0,1,2,3,4,5,.....]:

x = indgen(512)
rx = rebin(x,512,512)

;;create a mask
mask = image eq 65535

;; index values of the mask
rxmask = rx*mask

rightvalues = max(rxmask, dimension=1)

number_in_rows = total(mask, 1)

Report message to a moderator

[Message index]

		Re: how many array elements with a certain value in a row By: jeanh on Thu, 01 April 2010 08:22
		Re: how many array elements with a certain value in a row By: Jeremy Bailin on Thu, 01 April 2010 08:11
		Re: how many array elements with a certain value in a row By: Chris W on Thu, 01 April 2010 07:14
		Re: how many array elements with a certain value in a row By: Jeremy Bailin on Thu, 01 April 2010 06:56
		Re: how many array elements with a certain value in a row By: Chris W on Thu, 01 April 2010 06:48
		Re: how many array elements with a certain value in a row By: Jeremy Bailin on Thu, 01 April 2010 06:40
		Re: how many array elements with a certain value in a row By: ben.bighair on Thu, 01 April 2010 06:17
		Re: how many array elements with a certain value in a row By: Gray on Thu, 01 April 2010 06:03
		Re: how many array elements with a certain value in a row By: David Fanning on Thu, 01 April 2010 06:02

Previous Topic:	Re: IDL: problem on reading ncdf file with short type data
Next Topic:	Re: Image error calculation

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 18:04:02 PDT 2025

Total time taken to generate the page: 0.00462 seconds