Display mutiple lines in Text area in Matlab App designer

Question

Emerson Nithiyaraj 2022-5-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1712965-display-mutiple-lines-in-text-area-in-matlab-app-designer

评论： Emerson Nithiyaraj 2022-5-18

I have attached my code below.

for a = 1:length(my_Files)
    baseFileName1 = my_Files(a).name;
    fullFileName1 = fullfile(myDir, baseFileName1);
    i = imread(fullFileName1);
    if max(max(i)) == 255
        char6 = sprintf('%s has the presence of tumour \n',baseFileName1);
        app.TextArea3.Value = char6;
        c=c+1;
    end
end
            

I want the text area to display multiple lines like,

Image 1 has the presence of tumour

Image 2 has the presence of tumour

Image 3 has the presence of tumour

Image 4 has the presence of tumour .......

But I get only the last image name in the text area and i coudnt get all the image names as multiple lines.

Image 127 has the presence of tumour

I need someone's help to sort this out.

Thanks in advance.

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Monica Roberts 2022-5-9

在 MATLAB Online 中打开

I see 2 problems here. 1. You are clearing out char6 on every loop iteration. 2. If a is greater than 1, char6 has a bunch of empty cells. To see what I mean, try this code in the command window:

temp{4,1} = 'Example text'

You can make the variable before the for-loop and then tack on text to the end:

char6 = {};
for a = 1:length(my_Files)
    baseFileName1 = my_Files(a).name;
    fullFileName1 = fullfile(myDir, baseFileName1);
    i = imread(fullFileName1);
    if max(max(i)) == 255
        char6{end+1,1} = char(sprintf('%s has the presence of tumour \n',baseFileName1));
        app.TextArea3.Value = char6;
        c=c+1;
    end
end

Emerson Nithiyaraj 2022-5-18

thank you so much @Monica Roberts. Your sugggestion worked out exactly.

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Answer 1

Rik 2022-5-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1712965-display-mutiple-lines-in-text-area-in-matlab-app-designer#answer_958425

编辑：Rik 2022-5-9

在 MATLAB Online 中打开

You are replacing the text every iteration. What you need to do is concatenate them.

Start with an empty line before the loop, then append the new results in your loop.

Edit:

for a = 1:numel(my_Files)
    baseFileName1 = my_Files(a).name;
    fullFileName1 = fullfile(myDir, baseFileName1);
    im = imread(fullFileName1);
    char6 = '';
    if max(im(:)) == 255
        if isempty(char6)
            char6 = sprintf('%s has the presence of tumour',baseFileName1);
        else
            char6 = sprintf('%s\n%s has the presence of tumour',char6,baseFileName1);
        end
        app.TextArea3.Value = char6;
        c=c+1;
    end
end

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Emerson Nithiyaraj 2022-5-9

I tried this but, I still get only the last image name in the text area. I didnt get multiple image names in the text area.

Rik 2022-5-9

在 MATLAB Online 中打开

You can also use a cellstr instead of a char vector:

for a = 1:numel(my_Files)
    baseFileName1 = my_Files(a).name;
    fullFileName1 = fullfile(myDir, baseFileName1);
    im = imread(fullFileName1);
    char6 = '';
    if max(im(:)) == 255
        if isempty(char6)
            char6 = {sprintf('%s has the presence of tumour',baseFileName1)};
        else
            char6{end+1,1} = sprintf('%s\n%s has the presence of tumour',char6,baseFileName1);
        end
        app.TextArea3.Value = char6;
        c=c+1;
    end
end