MATLAB: I want to add a 20 by 20 matrix to a 50 by 50 matrix ? the resuting matrix should be of 50 by 50 .

addition of square matrices

For Example : A=5*ones(50) & B=2*ones(20) , how should A+B be evaluated ?

Best Answer

 A=5*ones(50)
B=zeros(50);
B(1:20,1:20)=2*ones(20);
C=A+B;

Related Solutions

MATLAB: I have a marix of zeros(100100) and i have 5 values of rows and cols in rc.(getting these values from another function). Now i want to make a new matrix B of same size as A(100100) and want ones on that rows and cols provided by rc and zeros else

rc = [2  5
      3  5
      7  9
     15 69
     95 6];
B = full(sparse(rc(:, 1), rc(:, 2), 1, size(A, 1), size(A, 2)));

is one way of doing it. Another way:

B = zeros(size(A));
B(sub2ind(size(B), rc(:, 1), rc(:, 2))) = 1;

MATLAB: What do you mean by mask(50:end-50,50:end-50);

How about this:

It writes a white rectangle into the middle of an array. Presumably it's black/false/0 in the 50 pixel wide border around the mask image. It can be used to blacken the gray scale image either inside or outside the mask area.

Best Answer

Related Solutions

MATLAB: I have a marix of zeros(100*100) and i have 5 values of rows and cols in rc.(getting these values from another function). Now i want to make a new matrix B of same size as A(100*100) and want ones on that rows and cols provided by rc and zeros else

MATLAB: What do you mean by mask(50:en​d-50,50:en​d-50);

Related Question

MATLAB: I have a marix of zeros(100100) and i have 5 values of rows and cols in rc.(getting these values from another function). Now i want to make a new matrix B of same size as A(100100) and want ones on that rows and cols provided by rc and zeros else

MATLAB: What do you mean by mask(50:end-50,50:end-50);