vector: index greater than or equal vector size about cppad

[bradbell]

Run your program in gdb (I assume from the message above that you are compiling with debugging).
When the error occurs, the program will stop at the debugger prompt.
Use the debugger command where to see the current call stack.
You can then determine the line in your source code where are are trying to access an non-existent element of the vector.

[bradbell]

Would you please close this issue if this solves it for you.

[hichamhendy]

I happen to run against this problem in actually a very trivial line namely
std::cout << solution.x[x_start + 1]; and CppAD::ipopt::solve_result<Dvector> solution; abd by the way const size_t x_start = 0;

any ideas?

[passer-by-Wang]

hello， I met this issue ,too. Could you please give a solution of if you have solved it?

[bradbell]

@passer-by-Wang Have you tried running the program in a debugger like gdb ?

[passer-by-Wang]

could you please give me more details about a debugger like gdb? I run it in terminal in ubuntu. Commands are as follow:
mkdir build
cd build
cmake ../
make
./cppad_ipopt_demo

[passer-by-Wang]

actually, it successes under ubuntu system of VMware but fails under ubuntu system under my Desktop computer with dual systems

[bradbell]

Here is a gdb tutorial:
https://web.eecs.umich.edu/~sugih/pointers/summary.html

All you should need to do is to run it in the debugger. Then when the error occurs, use the up command until you get to the source code that is trying to use the vector outside of its valid range; see
https://visualgdb.com/gdbreference/commands/up

[bradbell]

@passer-by-Wang Did the suggestion above work for you ?