Hi, I'm very new to NLopt. I implemented the C++ example on NLopt Tutorial 
page(http://ab-initio.mit.edu/wiki/index.php/NLopt_Tutorial) to get 
myself familiar with this library. It worked all fine with LD_MMA and 
LN_COBYLA until I changed the algorithm into LN_NELDERMEAD. I could pass the 
compilation but got 
"terminate called after throwing an instance of 'std::invalid_argument'
  what():  nlopt invalid argument
Aborted" 
returned when I tried to run it. Can someone enlighten me what went wrong here? 
It's really confusing to me that one optimization problem that runs fine in one 
algorithm couldn't pass another one. Thank you!
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