How to remove zeros using Function in Matlab?
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reyadh Albarakat on 24 Aug 2016
This 1st time I used a Matlab Function, I used it to read two images (Tiff format), one of them has NaN values and 2nd image has Zeros. I want to remove NaN and Zeros rows completely. By the way the output of 1st image is fine but the problem in the output of 2nd image. I have attached the Function and Script.
Thank you in Advance
function [out_image] = img_read_1(input_image,no_data)
%%%out_image ::: this is the name of your out image
%%%input_image ::: this is the name of your input image
%%%fname ::: dir name
out_image(find(out_image(:)<=no_data)) = NaN;
Guillaume on 24 Aug 2016
Considering that the nans you want to remove are the ones you put there on the previous lines, why put the nans in the first place?
To remove a row where any of the value on the row satisfy a condition, you would use the any function, so:
out_image(any(isnan(out_image), 2), :) = ; %remove rows that contain any nan
But as said, there's no point putting the nans there in the first place, so:
%replace the last three lines:
out_image = image_t(all(image_t > no_data, 2)); %only keeps rows of image_t whose values are ALL greater than no_data
Finally, note that the find is completely unnecessary in the code you wrote:
out_image(out_image <= no_data) = NaN;
%works exactly the same as
out_image(find(out_image <= no_data)) = NaN
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