docs: public static void transpose( DMatrixRMaj mat ) {
          if( mat.numCols == mat.numRows ){
              TransposeAlgs_DDRM.square(mat);
          } else {
              DMatrixRMaj b = new DMatrixRMaj(mat.numCols,mat.numRows);
              transpose(mat,b);
              mat.set(b);
          }
      }