Creating a Sparse Matrix

2019 2 26
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更新时间：2019 2 26
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I have a big matrix B and I get it by concatenating the small matrices.
B = [A1 M1 M2 Z1
M1' M2' Z2 A2];
But when I store this matrix, its size is very big and it takes up a lot of memory. I want to convert it to sparse matrix. The matrices Z1 and Z2 have all zero elements and, M1 and M2 also have a lot of zeros.

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Alex Mcaulley
Alex Mcaulley 2019-2-26
What is the question? you can use sparse function to convert your full matrix in sparse matrix
https://es.mathworks.com/help/matlab/ref/sparse.html
Ahmad Hasnain
Ahmad Hasnain 2019-2-26
Should I convert the small matrices to sparse and then add them to the big matrix or Can I assemble B in such a way that it ends up being a sparse matrix?
B = [A1 M1 M2 Z1
M1' M2' Z2 A2];
Because with this code I can't get a sparse matrix. Is there another way to assemble this matrix?
Alex Mcaulley
Alex Mcaulley 2019-2-26
yes, you should convert your small matrix to sparse and then combine them to obtain the sparse big matrix to avoid problems with memory
Jos (10584)
Jos (10584) 2019-2-26
What do you want to do with B? In other words, do you really need to create it?
Ahmad Hasnain
Ahmad Hasnain 2019-2-26
I use B in a quadratic equation. I need to multiply it with some vectors.

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