code: public float getFloatValueFromMap( RandomIter map ) {
          try {
              if (map == null) {
                  return HMConstants.floatNovalue;
              }
              float value = map.getSampleFloat(col, row, 0);
              return value;
          } catch (Exception e) {
              // ignore and return novalue
              return HMConstants.floatNovalue;
          }
      }
docs: Get the float value of another map in the current node position.
  
  @param map the map from which to get the value.
  @return the float value or a novalue.