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Re: How to create a 2D mask that automatically half�san irregularly shaped 2D array from top to bottom? [message #78378]

Fri, 18 November 2011 07:28

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article <8c3834d3-30ca-49a8-9d0e-6bf9d97c0c9f@l23g2000pro.googlegroups.com>,
"Dr G." <gjhay@ucalgary.ca> wrote:

> Hi Folks,
>
> Q: Can the IDL geometry geniuses out there think of a fast way to
> create a 2D mask that automatically half�s 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

What is it that you want? The index of the middle 1 in each row?

Ken

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