Vector-Matrix-Multiplication in java with parallel colt

Question

I would like to multiply a vector (1 x n) with a matrix (m x n) in java and the library parallel colt. I guess I have chosen it because it has parallel in its name. So you are invited to give me other nice matrix librarys in java.

But my problem is particular the vector-matrix-multiplication... I haven't found a seperate method for it on the DenseDoubleMatrix2D class? How can I do it?

Thanks!

Answer 1

The matrix multiplication can be done by the DoubleAlgebra class, which has the overloaded mult methods.

• mult(DoubleMatrix1D x, DoubleMatrix1D y), to compute the inner product of two vectors.
• mult(DoubleMatrix2D x, DoubleMatrix1D y), for matrix-vector multiplication.
• mult(DoubleMatrix2D x, DoubleMatrix2D y), for matrix-matrix multiplication.