| Re: How to Find Bimodal peak values in an array [message #74868] |
Sun, 06 February 2011 06:05 |
Gray
Messages: 253
Registered: February 2010
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Senior Member |
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On Feb 6, 12:55 am, vijay <vijayans...@gmail.com> wrote:
> hi friends,
>
> i have an array/image of 512x512 and want to find maximum
> value in each row (similar to Craig B. Markwardt 'CMAPPLY' but it
> results in one dimensional array).
>
> 1) I want the maximum of each row in an array in same location as that
> of input array (other values tend to be zero).
>
> 2) Moreover, each row of my input array contains bimodal peak, i also
> want that second maximum/peak in each row and that to be resulted in
> the same output array.
>
> Thus, the final 2dimensional array should have first and second
> maximum/peak in each row and remaining tends to zero.
>
> note: i mean the second maximum is similar to bimodal pattern second
> maximum.
Well, you can try something like:
IDL> output_array = 0.*input_array
IDL> peak1 = max(input_array,ind,dimension=1)
IDL> output_array[ind] = peak1
IDL> tmp = input_array
IDL> tmp[ind] = 0.
IDL> peak2 = max(temporary(tmp),ind,dimension=1)
IDL> output_array[ind] = peak2
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