CODEWITHSUNDEEP
c++matrixlinear-algebraublas
al0
al0

Reputation: 308

Creating a matrix from vectors in C++ with uBLAS

If I have n vectors of length m and want to join them to create an mxn matrix, what is the most efficient way to do this in C++ using Boost uBLAS?

Obviously, I can just loop though them and assign each matrix element with the corresponding vector value, but I feel like there is a better way to do this I am unaware of.

Upvotes: 4

Views: 878

Answers (1)

Steve Townsend
Steve Townsend

Reputation: 54178

Rather than iterating the entire list of vectors element-wise, I would try assigning each of your vectors directly into the corresponding matrix column. 

template<class AE >  
BOOST_UBLAS_INLINE matrix_column &  operator= (const vector_expression< AE > &ae)

You have to copy each element at some point, but this should be faster than a nested loop (or a perf bug in Boost.uBlas, if not).

Upvotes: 2

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