VECTMULT is the jCommon module of jLab.

 VECTMULT  Matrix multiplication for arrays of vectors. 
    [Y1,Y2,...,YM]=VECTMULT(A,X1,X2,...,XN) is equivalent to the usual
    multiplication of a matrix by a vector,
            Y = A * X
    where A is an M x N matrix, X is an N-vector, and Y is an M-vector.
    X1--XN and Y1--YM are the components of X and Y respectively.
    Often however one has arrays of vectors.  Here we group the N 
    components of X into N arrays, X1,X2,...,XN, which can be of any size
    provided they are all the same size.
    VECTMULT then returns the components of the output vector Y as the M
    arrays Y1,Y2,...,YM.
    The matrix A may be a M x N matrix, or alternatively, it may be an 
    array of size M x N x SIZE(XN).
    See also MATMULT.
    Usage: [y1,y2]=vectmult(a,x1,x2);
    'vectmult --t' runs a test.
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2004--2015 J.M. Lilly --- type 'help jlab_license' for details

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