performance/src/main/java/org/justinnk/masonssa/evaluation/DataFrame.java
/**
   * Computes a function on an existing value at the index of all columns (or null, if there is no
   * value associated with the index).
   */
Computes a function on an existing value at the index of all columns (or null, if there is no
value associated with the index).
Computes a function on an existing value at the index of all columns ( or null if there is no value associated with the index ) .
public void compute(int index, BiFunction<Object, Object, Object> func) {
    for (Column c : columns) {
      c.compute(index, func);
    }
  }
public void compute ( int index , BiFunction < Object , Object , Object > func ) { for ( Column c : columns ) { c . compute ( index , func ) ; } }
Computes a function on an existing value at the index of all columns (or null, if there is no
 value associated with the index).
Computes a function on an existing value at the index of all columns ( or null if there is no value associated with the index ) .