code: public static void checkSvdMatrixSize(DMatrixRMaj U, boolean tranU, DMatrixRMaj W, DMatrixRMaj V, boolean tranV ) {
          int numSingular = Math.min(W.numRows,W.numCols);
          boolean compact = W.numRows == W.numCols;
  
          if( compact ) {
              if( U != null ) {
                  if( tranU && U.numRows != numSingular )
                      throw new IllegalArgumentException("Unexpected size of matrix U");
                  else if( !tranU && U.numCols != numSingular )
                      throw new IllegalArgumentException("Unexpected size of matrix U");
              }
  
              if( V != null ) {
              if( tranV && V.numRows != numSingular )
                  throw new IllegalArgumentException("Unexpected size of matrix V");
              else if( !tranV && V.numCols != numSingular )
                  throw new IllegalArgumentException("Unexpected size of matrix V");
              }
          } else {
              if( U != null && U.numRows != U.numCols )
                  throw new IllegalArgumentException("Unexpected size of matrix U");
              if( V != null && V.numRows != V.numCols )
                  throw new IllegalArgumentException("Unexpected size of matrix V");
              if( U != null && U.numRows != W.numRows )
                  throw new IllegalArgumentException("Unexpected size of W");
              if( V != null && V.numRows != W.numCols )
                  throw new IllegalArgumentException("Unexpected size of W");
          }
      }
docs: Checks to see if all the provided matrices are the expected size for an SVD.  If an error is encountered
  then an exception is thrown.  This automatically handles compact and non-compact formats