Coordinates of a vector

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Deep P 2017-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/369547-coordinates-of-a-vector

评论： Star Strider 2017-11-27

Hello,

I am trying to find the coordinates of all elements of a vector, with reference to a image. However, in the for loop, only the last element's coordinates are shown. Please help how to increment the coordinates and keep all their values using subscripts for the coordinates.

for ex; if my vector is [1 2 3 4], I Want to find coordinates of all these elements with reference to another image , say 'I'. I used find.

here is my code, for i=1:4 [x,y]=find(I=vector(i)); end. But in the command window, only the fourth element's coordinates are shown and I wanted all the element's coordinates. Please help. Thank you

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Answer 1

Star Strider 2017-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/369547-coordinates-of-a-vector#answer_293404

在 MATLAB Online 中打开

Try this:

for i=1:4
    [x{i},y{i}]=find(I==vector(i));
end

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Deep P 2017-11-27

Thanks for your response, since resultant is a cell array, how do i get each element which is a vector and perform my operations?

Star Strider 2017-11-27

在 MATLAB Online 中打开

You have to extract each to a (Nx2) matrix:

M = cell2mat([x{1} y{1}]);

and so for the rest. If the all have the same number of rows, then you can concatenate them horizontally and use cell2mat on the concatenated cell arrays.

See Access Data in Cell Array (link) for an extended discussion.

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