MATLAB: How to multiply just certain elements of a column in a matrix by a factor

MATLABmatrix

Supposing if I have a matrix of 20×3 (20 rows and 3 columns). I want to multiply 5th to 10th element of 3rd column by a factor, say zero. How can I do that?

Best Answer

testMat=ones(20,3)
testMat(5:10,3)=testMat(5:10,3).*0

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MATLAB: Reshape a column vector in a row-wise direction

A= [1;2;3;4;5;6;7;8;9;10 ] ;
B = reshape(A,[],2)'

MATLAB: I have matrix with dimension 2151*100,i want to subtract 1st column from 3,3rd column from 6 ,6th from 9th and so on..till 100th column. Please suggest any simple way to do this.

Vikas - are you subtracting the updated third column from the sixth (etc.)? If so, you could do something like

 A = rand(2151,100);
 for k=3:3:100
     if k==3
         A(:,k) = A(:,k) - A(:,1);
     else
         A(:,k) = A(:,k) - A(:,k-3);
     end
 end

The above should perform the expected subtraction. (There will be the ways too.)

Best Answer

Related Solutions

MATLAB: Reshape a column vector in a row-wise direction

MATLAB: I have matrix with dimension 2151*100,i want to subtract 1st column from 3,3rd column from 6 ,6th from 9th and so on..till 100th column. Please suggest any simple way to do this.

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