about dynamic variable name for output

Question

Huseyin 2016-12-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/317231-about-dynamic-variable-name-for-output

编辑： Stephen23 2019-6-19

Hi there, In the code below I want dynamic outputs for 'k' value in the loop. For instance if c=2 I want to get region_number1,region_number2,locs1, locs2 for the output. How can I do this?

for k=1:c
    [region_number,locs]=find_region_pixels(first_order_big(:,:,k),orig_image);
end

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Huseyin 2016-12-17

first_order_big has multidimensional data inside. So this code gives me an error like: "In an assignment A(:) = B, the number of elements in A and B must be the same."

How can I fix this?

Walter Roberson 2016-12-17

在 MATLAB Online 中打开

 region_number = NaN(1, c);
 locs = cell(1, c);
 for k = 1:c
    [region_number(k),locs{k}] = find_region_pixels(first_order_big(:,:,k),orig_image);
  end

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Answer 1

Stephen23 2016-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/317231-about-dynamic-variable-name-for-output#answer_247559

编辑：Stephen23 2019-6-19

https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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Jan 2016-12-17

编辑：Jan 2016-12-17

100 votes from me.

@Mathworks: Please let this answer appear whenever a user types the terms "dynamic" and "variable" in one sentence.

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Answer 2

Image Analyst 2016-12-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/317231-about-dynamic-variable-name-for-output#answer_247593

在 MATLAB Online 中打开

Yes, you can use regionprops, which will measure those things. Then put the results into a cell array:

for k = 1 : numberOfImages
    thisLabeledImage = first_order_big(:,:,k);
    % Ask for PixelList, which is a list of all (x,y) points that are white/true/1 in the labeled image.
    props = regionprops(thisLabeledImage ,orig_image, 'PixelList');
    % There may be more than one blob in the image, so props is a structure array.
    % For this image, just store this image's blobs' coordinates into a cell array for use later.
    blobPixels{k} = props(k);
end