Package org.renjin.primitives.matrix

Examples of org.renjin.primitives.matrix.MatrixBuilder


  public static Vector Rrowsum_matrix(Vector x, int ncol, AtomicVector groups, AtomicVector ugroup, boolean naRm) {
   
    int numGroups = ugroup.length();
   
    Matrix source = new Matrix(x, ncol);
    MatrixBuilder result = source.newBuilder(numGroups, ncol);
   
    for(int col=0;col!=ncol;++col) {
     
      // sum the rows in this column by group
     
      double groupSums[] = new double[numGroups];
      for(int row=0;row!=source.getNumRows();++row) {
        int group = ugroup.indexOf(groups, row, 0);
        groupSums[group] += source.getElementAsDouble(row, col);
      }
     
      // copy sums to matrix
      for(int group=0;group!=ugroup.length();++group) {
        result.setValue(group, col, groupSums[group]);
      }
     
    }
    return result.build();
  }
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