docs: protected void firstRow(double[] buf, int band, NumberVector v1, NumberVector v2, int dim2) {
      // First cell:
      final double val1 = v1.doubleValue(0);
      buf[0] = delta(val1, v2.doubleValue(0));
  
      // Width of valid area:
      final int w = (band >= dim2) ? dim2 - 1 : band;
      // Fill remaining part of buffer:
      for(int j = 1; j <= w; j++) {
        buf[j] = buf[j - 1] + delta(val1, v2.doubleValue(j));
      }
    }