spec/dataframe-spec.js
function(subset, key) {
            return [
              key.nRow(),
              key.nCol(),
              key.at(0, 'D'),
              key.at(0, 'C'),
            ];
          }
function(subset, key) {
            return [
              key.nRow(),
              key.nCol(),
              key.at(0, 'D'),
              key.at(0, 'C'),
            ];
          }
function ( subset , key ) { return [ key . nRow ( ) , key . nCol ( ) , key . at ( 0 , 'D' ) , key . at ( 0 , 'C' ) , ] ; }
Check groupKey dimensions and content
Check groupKey dimensions and content