Change element of a matrix in a row

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Selim Karakurt 2016-11-3

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https://ww2.mathworks.cn/matlabcentral/answers/310450-change-element-of-a-matrix-in-a-row

编辑： Thorsten 2016-11-4

Hello community,

I am using matlab for image processing. I filter the image and get a black-white image and after that i want to count them. I finished that. The problem is that in the Matrix there are white places. For better understanding i gave you an example.

0 0 0 0 0

1 0 1 0 0

0 1 0 0 1

1 1 1 1 0

1 0 0 0 1

the result should be

0 0 0 0 0

1 1 1 0 0

0 1 1 1 1

1 1 1 1 0

1 1 1 1 1

I can't code it so please i need your help. I hope you can help me.

Thanks!

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Jan 2016-11-3

Please explain the procedure: Do you want to the rows to be filled by 1s between the first and the lase 1?

Selim Karakurt 2016-11-3

JES! I tried to give an example. But KSSV answer was good but it dont work because i have to change my logical matrix in to a double matrix. but when i do so my double matrix is filled with only 1 and i loose my information. you can look down what i talked with him. Thanks!

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回答（2 个）

KSSV 2016-11-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310450-change-element-of-a-matrix-in-a-row#answer_241816

编辑：KSSV 2016-11-3

在 MATLAB Online 中打开

A = [0 0 0 0 0
1 0 1 0 0
0 1 0 0 1
1 1 1 1 0
1 0 0 0 1 ] ;
B = A ;
[m,n] = size(A) ;
for i = 1:m
    idx = find(A(i,:)==1) ;
    if ~isempty(idx)
        B(i,idx(1):idx(end)) = 1 ;
    end
end
B