Change or save data .txt

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Akmal Rahmat 2014-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/163858-change-or-save-data-txt

评论： Image Analyst 2014-11-23

a = dlmread('test4.txt');
b = dlmread('test5.txt');
if (a-b)>125
   c = (a-b)>125;
   c = 0;
   c = dlmmwrite('test4.txt','delimiter');
   c = dlmwrite('test5.txt','delimiter');
end

hello all. i need help.here is my code. how do i change the data in my .txt file ? when a-b meet my condition i want to change it in both .txt file. i keep getting error. please help me. thank you

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Akmal Rahmat 2014-11-22

here is the text file. i want to change both file value when it meet the condition where the a-b value more than 125 then the number in the txt file will change to zero.

Guillaume 2014-11-22

编辑：Guillaume 2014-11-22

在 MATLAB Online 中打开

If you'd answered the question I asked we would be much closer to helping you. So, once again, if

a = [255 255 0   124 126]
b = [255 0   255 126 124]

What final a and b do you expect? Bearing in mind that:

(a-b) == [0 255 -255 -2 2]

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回答（1 个）

Image Analyst 2014-11-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163858-change-or-save-data-txt#answer_159884

编辑：Image Analyst 2014-11-22

在 MATLAB Online 中打开

Try this (untested because you didn't attach your text files):

a = dlmread('test4.txt');
b = dlmread('test5.txt');
c =(a-b)>125; % Logical array
a(c) = 0; % Replace elements in a with 0;
b(c) = 0; % Replace elements in b with 0;
% Write updated a and b back out.
dlmwrite('test4.txt', a);
dlmwrite('test5.txt', b);

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Akmal Rahmat 2014-11-22

在 MATLAB Online 中打开

a and b are different sizes ? i just resize a to 100x100 and rename it as b ? is my code right?

originally my task is to compare two image that been convert to text file. i attach the image that i will use. all i want is to read each value in both text file then make comparison of it and show the percentage of different between two text file.

a = imread('img2.jpg');
b = imresize(a,[100,100])
dlmwrite('test4.txt', b, 'delimiter', ',');
d = dlmread('test4.txt');
e = imread('img1.jpg');
f = imresize(e,[100,100])
dlmwrite('test5.txt', f, 'delimiter', ',');
g = dlmread('test5.txt');

here is my way to convert the image to text file. the problem is how to calculate the different between two text file. sir do you have any idea how i should do it. i am stuck here.