How to store individual return value of a function

Question

Tipu Sultan 2019-4-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458455-how-to-store-individual-return-value-of-a-function

评论： Tipu Sultan 2019-4-26

采纳的回答： KALYAN ACHARJYA

在 MATLAB Online 中打开

I want to store individeual return values to a variable

The code is as follows:

function tri=imageReadFromFolder()
something!
tri=[z,distance,angle];
end

As can be seen it basically reads set of images from a folder and for each image it will have individual 'z,distance,angle' .But after it reads it only shows the result for the last images.

Any help on how to solve this will be highly appreciated.

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Jan 2019-4-25

编辑：Jan 2019-4-25

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The question is not clear. What is "something!"? Where does "z,distance,angle" come from? It cannot be seen (especially not "basically"), that a set of images is read here. There is no code to read images, there I cannot guess, why the data of the "last" image are replied only. Most likely you use a loop and write:

for k = 1:numel(images)
    img = import_image()
    z = fcn(Img)
end

instead of

    z(k) = fcn(Img)
%    ^^^ 

Please edit your question and post some working code, which reproduces the problem. If we guess, what the problem is, the answers will be more or less unrelated.

Tipu Sultan 2019-4-26

在 MATLAB Online 中打开

I am giving you the whole code:

function tri=imageReadFromFolder()
D = 'C:\Users\Tipu_Standard\Desktop\testIMAGES';
S = dir(fullfile(D,'Original*.jpg')); % pattern to match filenames.
for i = 1:numel(S)
    F = fullfile(D,S(i).name);
    I = imread(F);
    B = rgb2gray(I);
    A=adapthisteq(B);
    % Display the original image
    figure,imshow(A);
    distance =0;
    angle=0;
    rmin=8;
    rmax=30;
    
    % Find all the circles with radius >= 8 and radius <= 30
    [centersdark,radiidark] = imfindcircles(A,[rmin rmax],'Objectpolarity','dark','Sensitivity',0.913);
    k=numel(radiidark);
    viscircles(centersdark,radiidark ,'EdgeColor','b');          
    if(k==0)
        z=0;
    else
        z=1;
        p=2*radiidark;
        f=2.1;
        w=62;
        h=144;
        s=2.88;
        distance=(f*w*h)/(p*s);
        a=(192/2)-centersdark(1); 
        b=144-centersdark(2);
        angle=atan2(a,b)*(180/pi);
    end
    tri=[z,distance,angle];
end
end

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Answer 1

KALYAN ACHARJYA 2019-4-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458455-how-to-store-individual-return-value-of-a-function#answer_372393

编辑：KALYAN ACHARJYA 2019-4-26

在 MATLAB Online 中打开

Inputs in Main script help to change the input easily.

Main scripts:

D = 'C:\Users\Tipu_Standard\Desktop\testIMAGES';
S = dir(fullfile(D,'Original*.jpg')); % pattern to match filenames.
for i = 1:numel(S)
    F = fullfile(D,S(i).name);
    I = imread(F);

% Next line changes required, k{i}, I missed the account the size of function output please check the below @Stephen Comment

    k(i)=fun1(I); 
end

Here k gives the values of individual images, like k(1),k(2)...

Make the different function file

function tri=fun1(I)    
    B=rgb2gray(I);
    A=adapthisteq(B);
    % Display the original image
    figure,imshow(A);
    distance =0;
    angle=0;
    rmin=8;
    rmax=30;
    % Find all the circles with radius >= 8 and radius <= 30
    [centersdark,radiidark] = imfindcircles(A,[rmin rmax],'Objectpolarity','dark','Sensitivity',0.913);
    k=numel(radiidark);
    viscircles(centersdark,radiidark ,'EdgeColor','b');          
    if(k==0)
        z=0;
    else
        z=1;
        p=2*radiidark;
        f=2.1;
        w=62;
        h=144;
        s=2.88;
        distance=(f*w*h)/(p*s);
        a=(192/2)-centersdark(1); 
        b=144-centersdark(2);
        angle=atan2(a,b)*(180/pi);
    end
    tri=[z,distance,angle];
end