What is this error

Hello everyone.

While using GlobalSearch in my global optimization routine, I incountered the following error:

Error using globalsearchnlp (line 110)
All elements of X must be real.

Im not able to open this file, "globalsearchnlp". What are these X? How can I fix it?

Many thanks!

[Jonathan Epperl]

Try

dbstop if error

before you execute your global search. It'll stop in the debugger then, maybe that'll enable you to find out what's wrong.

[Shashank Prasanna]

Any code examples you could provide?

Answer 1

[Walter Roberson]

Your function evaluations are sometimes producing imaginary numbers. Be sure to put in appropriate bounds on your function range.

[Somebody]

Yes, thank you. I found the place where my code produced complex numbers.