how to store big triangular matrix

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Anton
Anton on 8 Aug 2014
Answered: Jan on 10 Aug 2014
I need to store and operate(so time of referencing operations is very important) with thriangular matrix. How to do it effectively? I think that using of sparse matrix is not efficient because we need to store indexes. May be it is better to store as 1-d cell array of 1-d "normal" arrays? Or some other way? Please help. And sorry for my poor English
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Chris Turnes
Chris Turnes on 8 Aug 2014
How large are your matrices? Can you fit the whole matrix in memory, and if not, can you fit only the non-zero coefficients in memory? Given the density of the matrix, you are correct that storing it as a sparse array will not be efficient. However, using a full matrix may still be your best option because of the efficiency of MATLAB's operations with triangular matrices.

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Accepted Answer

Jan
Jan on 10 Aug 2014
It depends on what you are doing with the matrices. When you only want to store the matrices, but do not perform any operations, a cell vector seems to be sufficient. When you need column or row operations only, this might be efficient also.
But e.g. for a matrix multiplication this would be a severe disadvantage and a full matrix is much better.

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