void setValue(int ccDimIndex, double value) {
            while (values.size() <= ccDimIndex) {
                values.add(0.0);
            }
            values.set(ccDimIndex, value);
        }
Maps the content in the given list to the given array, using the given index map.

@return true if the mapping was successful, false if one of the destination positions was
        occupied by a different value
vespajlib/src/main/java/com/yahoo/tensor/functions/Concat.java