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Re: How to create a 2D mask that automatically half’s an irregularly shaped 2D array from top to bottom? [message #78370]

Fri, 18 November 2011 13:59

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On 11/18/11 2:53 PM, Jeremy Bailin wrote:
> On 11/18/11 10:04 AM, Dr G. wrote:
>> Hi Folks,
>>
>> Q: Can the IDL geometry geniuses out there think of a fast way to
>> create a 2D mask that automatically halfï¿½s an irregularly shaped 2D
>> array along its x axis (i.e., from top to bottom) Eg:
>>
>> [0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0]
>> [0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0]
>> [0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,0]
>> [0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0]
>> [0,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0]
>> [0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0]
>> [0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0]
>> [0,0,1,1,1,1,1,1,1,1,0,0,0,0,0,0]
>> [0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0]
>> [0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0]
>> [0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0]
>> [0,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0]
>>
>> Merci.
>>
>> Gf
>
> If the input mask is "inmask":
>
> ; how many 1s are there?
> rowtot = total(inmask, 1, /int)
> ; and it by checking if the cumulative total along the row is less
> ; than half of rowtot
> outmask = inmask and (total(inmask, 1, /int, /cumul) le $
> rebin(transpose(rowtot/2), masksize, /sample))
>
> -Jeremy.

Oops, missed the first line when I copied that in:

masksize = size(inmask, /dimen)

-Jeremy.

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[Message index]

		Re: How to create a 2D mask that automatically half’s an irregularly shaped 2D array from top to bottom? By: Jeremy Bailin on Fri, 18 November 2011 13:59
		Re: How to create a 2D mask that automatically half’s an irregularly shaped 2D array from top to bottom? By: Jeremy Bailin on Fri, 18 November 2011 11:53
		Re: How to create a 2D mask that automatically half’s an irregularly shaped 2D array from top to bottom? By: Dr G. on Tue, 22 November 2011 14:47

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