Hello,
I'd like to convert std::string to ex constructor.
But my code do not work now.
How to put variables to the second argument of
ex(const std::string &s, const ex &l).
----Code:
#include <iostream>
#include <ginac/ginac.h>
using namespace std;
using namespace GiNaC;
int main(){
string st("2*a+3*sqrt(4)*b");
symbol a("a"), b("b");
ex sample(st, ex(a));
cout << sample <<endl;
return 0;
}
----Excuted:
terminate called after throwing an instance of
'std::invalid_argument'
what(): find_or_insert_symbol: symbol "a" not found
IOT trap