Hello all,
I’m having trouble with running the example interactive program from the tutorial. I simply cut and pasted it, but after it asks for “an expression involving ‘x’ “ it just hangs and never does anything. The problem seems to be in the line ‘ex e = reader(cin)’, I got the other examples to run just fine, but the reader(cin) seems to be problematic.
My setup: Macbook Air1.5GHZ i7, OSX 10.9.1, ginac 1.6.2
My program:
#include <iostream>
#include <string>
#include <stdexcept>
#include <ginac/ginac.h>
using namespace std;
using namespace GiNaC;
int main()
{
cout << "Enter an expression containing ’x’: " << flush;
parser reader;
try {
ex e = reader(cin);
symtab table = reader.get_syms();
symbol x = table.find("x") != table.end() ?
ex_to<symbol>(table["x"]) : symbol("x");
cout << "The derivative of " << e << " with respect to x is ";
cout << e.diff(x) << "." << endl;
} catch (exception &p) {
cerr << p.what() << endl;
}
}
Commandline:
Caseys-MacBook-Air:ginac casey$ g++ ginacPlay.cpp -o ginacPlay.out -lginac -lcln
Caseys-MacBook-Air:ginac casey$ ./ginacPlay.out
Enter an expression containing ’x’: x
^C
…It just hangs there for several minutes.