access the respective values of matrix using the cell array cell position value

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Elysi Cochin 2020-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/511257-access-the-respective-values-of-matrix-using-the-cell-array-cell-position-value

评论： Elysi Cochin 2020-3-17

采纳的回答： Sriram Tadavarty

i have a matrix as shown in figure, with positions marked

I have a cell array with values

{ [ 1 4 ] ; [ 2 3] };

Now i want to take the values from position

{ [0-1 1-4] ; [0-2 2-3] } of the matrix

i.e. { [ 33 45]; [34 30] }

and get the sum of

33 + 45 +34 +30 = 142

how can i access the respective values of matrix using the cell array cell position values?

采纳的回答

Sriram Tadavarty 2020-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/511257-access-the-respective-values-of-matrix-using-the-cell-array-cell-position-value#answer_420482

编辑：Sriram Tadavarty 2020-3-17

Hi Elysi,

Here is what you have asked for

% Given matrix
a = [0 33 34 16 25;...
    22 0 20 12 45;...
    20 40 0 30 12;...
    16 12 30 0 44;...
    34 56 26 15 0];
% Cell positions
cellValue = {[1, 4], [2 3]};
% To make it generic, for any number of cell elements with varying size, you can use a for loop
s=0;
for i = 1:numel(cellValue)
    cellInd = cellValue{i};
    tmp = [];
    tmp(1) = a(0+1,cellInd(1)+1);
    for j = 2:length(cellInd)
        tmp = [tmp a(cellInd(j-1)+1,cellInd(j)+1)];
    end
    s = sum(tmp) + s;
end

Hope this helps.

Regards,

Sriram

Ya. Please take the latest code in the answer. I had written one value wrong in the matrix and that 10 increase is due to it. If you see the first row and third column of matrix a, it is written as 26 instead of 16.I did correct in it in the answer, take the latest code and check.

Elysi Cochin 2020-3-17