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How to find the row and column for a value within a matrix [c] nearest or equal to 700.

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Alex Hinchcliffe
Alex Hinchcliffe on 20 Apr 2021
Commented: Jan on 21 Apr 2021
Attempts so far.
for inputMat = [c];
[row,col] = find (c==700);
end
inputMat = [c];
[myRow, myCol] = find(inputMat (closest(700)));
numericalAns = [myRow myCol];

Accepted Answer

John D'Errico
John D'Errico on 20 Apr 2021
Edited: John D'Errico on 20 Apr 2021
Easy. And there would be many ways to do it.
c = rand(5,5)*1000
c = 5×5
954.2387 395.1216 623.5493 716.9854 244.7619 872.3532 774.9458 535.5974 226.3258 561.0368 336.4275 785.2196 738.6107 98.0277 66.3741 403.5059 623.4173 598.7175 232.5904 992.2769 692.0418 126.7045 426.2907 594.1339 735.1474
[~,ind] = min(abs(c(:) - 700))
ind = 5
[rowind,colind] = ind2sub(size(c),ind)
rowind = 5
colind = 1
So the closest element to 700 lives in row 5, column 1.
c(rowind,colind)
ans = 692.0418

More Answers (1)

Jan
Jan on 20 Apr 2021
Edited: Jan on 21 Apr 2021
find(inputMat (closest(700)))
This is pure guessing. Notice that a command like closest(X) cannot even work in theory, because you provide one input only. So if this command exists, Matlab would ask: "closest to what?"
for inputMat = [c];
This is not the way Matlab's FOR loop works.
Guessing is no successful strategy for such a powerful tool as Matlab. Please read the GEtting Started chapters of the documentation and read Matlab's Onramp: https://www.mathworks.com/learn/tutorials/matlab-onramp.html
[value, index] = min(abs(c(:) - 700))
[row, col] = find(c == c(index)) % [EDITED, Typo fixed]
% Replies multiple matchs, if there are some
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