can't parse "(3/4)nrt(5)"

[DXie123]

Parser p = new Parser();
Expression exp = p.parse('(3/4)nrt(5)');

Such code throw an error:
type 'Divide' is not a subtype of type 'Number' in type cast

[fkleon]

Thanks for the report!

The parser is in need of an overhaul, and there is at least one other outstanding bug (#10).
Will make sure to add this to the test cases for the rewrite.

[fkleon]

Hi, I'm currently revisiting this as part of another fix.

The n-th root is only implemented for the simple case where the index n is an integer and the radicant x is a real number. In that case, the correct syntax for the parser would be nrt(n,x).

If I understand your original report correctly, you are trying to evaluate the n-th root with a non-integer index, i.e.

This could easily be implemented by allowing non-integer index values (arbitrary expressions). The library is already converting the n-th root to its power form internally as above to evaluate and differentiate the expression.