How to subtract each column of a matrix from a column vector?

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M 2022-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/1685714-how-to-subtract-each-column-of-a-matrix-from-a-column-vector

回答： Image Analyst 2022-4-1

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Answer 1

James Tursa 2022-3-31

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编辑：James Tursa 2022-3-31

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Just do a usual subtraction and let MATLAB implicit expansion kick in:

M = your matrix
v = your column vector
result = v - M; % implicit expansion

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Answer 2

Image Analyst 2022-4-1

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在 MATLAB Online 中打开

If you don't have a version that has implicit conversion yet, you can do this, where v is your vector and m is your matrix.

% Create sample data.
v = randi(99, 3, 1)
v = 3×1
    28
    23
    78
m = randi(99, 3, 3)
m = 3×3
    82    23    62
    42    48    78
    67    16    83
[rows, columns] = size(m);
diffMatrix = zeros(rows, columns);
% Subtract each column of m one at a time from v.
for col = 1 : columns
    diffMatrix(:, col) = v - m(:, col);
end
% Show result in command window:
diffMatrix
diffMatrix = 3×3
   -54     5   -34
   -19   -25   -55
    11    62    -5