[GiNaC-list] convert from string to ex

[Pedro Sosa]

Hello I have a problem, I would like convert from string to ex to find the symbolic derivativeis it posible?void chequeaPrim(vector<string> ramaPrim)
{
    for(int i=0; i< ramaPrim.size();i++)
    {
        ex = ramaPrim[i];
    }
}


thanks
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