Implement power (^).
Fix 10-4+1=5 bug. Priority of additive expression was wrong.
Better error message for un-bounded symbol. We add line number which is not compatible to R.
Ver 0.8
Update TableOfContent.csv
Implement subscript multi dim with logical (i.e. df[logics,] ).
Implement which.min, which.max.
Fix which.min, which.max.
Support if else.