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The C++11 standard includes a new method to hardcode vectors. And using it, I hardcoded this data in int main():
std::vector <std::vector <double> > A = {{1, 2, 3, 1}, {2, 5, 4, 2}, {1, 4, 7, 3}, {1, 7, 9, 1}};
however, when i add this line:
std::vector <std::vector <double> > b = {{1}, {2}, {3}, {4}};
under the first line, CodeBlocks/GCC says: internal compiler error: Segmentation fault
why?
Internal compiler error means that gcc crashed during the compilation process. That looks like a gcc bug. Which gcc version do you use?
Per your comment, the solution is very likely to upgrade your compiler.