code: public static SimpleMatrix wrap( Matrix internalMat ) {
          SimpleMatrix ret = new SimpleMatrix();
          ret.setMatrix(internalMat);
          return ret;
      }
docs: Creates a new SimpleMatrix with the specified DMatrixRMaj used as its internal matrix.  This means
  that the reference is saved and calls made to the returned SimpleMatrix will modify the passed in DMatrixRMaj.
  
  @param internalMat The internal DMatrixRMaj of the returned SimpleMatrix. Will be modified.