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Subtracting 1 matrix from several columns in a larger matrix

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Jamie England
Jamie England 2019-2-11
评论： madhan ravi 2019-2-11
Hi all, this is probably an easy one but my minds gone blank. Basically I have a matrix 3553450x8 containing different measured data, I am looking to subtract 3 of these columns by a seperate matrix. anyone know how to do this, cheers

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madhan ravi
madhan ravi 2019-2-11
M(:,1:3) - N
% ^^^---- represent three columns can be any three columns
%M is of size 3553450x8
%N is of size 3553450x1

更多回答（1 个）

aara
aara 2019-2-11
You could form a similar sized matrix of zeros, place the desired values which you wish to subtract from the original data and the perfrom the subtraction operation:
placeholder = zeros(3553450,8);
placeholder(:,i:j) = data_to_remove %choose i and j to be the columns you wish to subtract,
% they must be adjacent to each other.
%if data is not adjacent to each other then do them manually via:
placeholder(:,i) = column1_data_to_remove;
placeholder(:,j) = column2_data_to_remove;
placeholder(:,k) = column3_data_to_remove;
dataMatrix = dataMatrix - data_to_remove;
Save on memory by using a sparse matrix with the placeholder.

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