code: public static void mult(ZMatrixRMaj a, ZMatrixRMaj b, ZMatrixRMaj c)
      {
          if( b.numCols >= EjmlParameters.CMULT_COLUMN_SWITCH) {
              MatrixMatrixMult_ZDRM.mult_reorder(a, b, c);
          } else {
              MatrixMatrixMult_ZDRM.mult_small(a, b, c);
          }
      }
docs: <p>Performs the following operation:<br>
  <br>
  c = a * b <br>
  <br>
  c<sub>ij</sub> = &sum;<sub>k=1:n</sub> { * a<sub>ik</sub> * b<sub>kj</sub>}
  </p>
  
  @param a The left matrix in the multiplication operation. Not modified.
  @param b The right matrix in the multiplication operation. Not modified.
  @param c Where the results of the operation are stored. Modified.