MATMULT is the jCommon module of jLab.

 MATMULT  Matrix multiplication for arrays of matrices. 
    Often we wish to form the matrix product A*B for two matrices A and B. 
    MATMULT performs matrix multiplication for arrays of such matrices.
    Let A be an array of K different M x N matrices, and similarly
    let B be an array of K different N x P matrices.
    C=MATMULT(A,B,DIM) returns an array of the K products CK=AK*BK, where 
    DIM gives the dimension in A on which the M x N matrix begins.
    Thus A, B, and C have the following dimensions
          A --   K1 x K2 x ... x M x N x ... x KN
          B --   K1 x K2 x ... x N x P x ... x KN
          C --   K1 x K2 x ... x M x P x ... x KN
    The usual matrix multiplication is then C=MATMULT(A,B,1).  
    A and B can have any dimensionality so long as the dimensions
    containing the matrices are adjacent to each other.
    See also VECTMULT.
    'matmult --t' runs some tests.
    Usage: matc=matmult(mata,matb,dim); 
    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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