Warnings during installation

[AnthonyEbert]

Thank you for the fast response. Great work 👍 The installation works well and I can replicate your example from the main page. From my side, the issue can be closed.

Maybe for the next version, I still got some warnings during the installation process, but I can not figure out, how important they are and if this needs to be fixed:

MMD_full_loop.cpp: In function 'double kernelMatrix_threshold_sum(const vec&, const vec&, const vec&, const vec&, float, float, int)':
MMD_full_loop.cpp:127:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < n_x; ++i){
^
MMD_full_loop.cpp:128:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = start_p; j < n_y; ++j){
^
MMD_full_loop.cpp:114:7: warning: unused variable 'end_p' [-Wunused-variable]
int end_p = n_y;
^
MMD_full_loop.cpp: In function 'double kernelMatrix_sum(const vec&, const vec&, const vec&, const vec&, float, int)':
MMD_full_loop.cpp:85:56: warning: 'exp_f' may be used uninitialized in this function [-Wmaybe-uninitialized]
output_2 += w_x[i] * w_y[j] * exp_f(- 0.5 * b * b);
^
MMD_full_loop.cpp: In function 'double kernelMatrix_threshold_sum(const vec&, const vec&, const vec&, const vec&, float, float, int)':
MMD_full_loop.cpp:140:58: warning: 'exp_f' may be used uninitialized in this function [-Wmaybe-uninitialized]
output_2 += w_x[i] * w_y[j] * exp_f(- 0.5 * b * b);

Originally posted by @lukasfehrenbach in #4 (comment)