extracting the index of an irregular line on a 2D matrix

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hamed 2020-11-27

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评论： KSSV 2020-11-27

Hi.

I have a 2D matrix and a vector which passes through some samples of this matrix irregularly. The vector values shows the Y values of the samples it passes through. I want to extract the index of each sample of this vector roughly. In other words, I want to know the corresponding index number of each vector sample, in the matrix. Please find attached the image. The vector values are shown in white line passes throgh the 2D matrix (image).

Any suggestions?

Thanks.

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KSSV 2020-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/664673-extracting-the-index-of-an-irregular-line-on-a-2d-matrix#answer_557513

在 MATLAB Online 中打开

Read about ismember.

A = rand(10) ; 
B = A(randperm(100,10)) ; 
[c,ia] = ismember(A(:),B) ;
A(c) 

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hamed 2020-11-27

KSSV 2020-11-27

Then how you expect to extract? For every given t, we will get a complete column of x.

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