DLL load failed with scipy.optimize?

Question

I\'m trying to upload the curve_fit from scipy.optimize to fit an exponential function to some data I have generated. My code looks like:

import matplotlib.p         


        

Answer 1

Not sure if this is an answer for you, because this error can mean so many things... I've been there...

I just had the same error (also while loading Scipy optimize) just 10 minutes ago with a fresh install of Miniconda for Python 3.3 on a Vista x64 machine. Somehow it failed to add the main Python directory to the Windows PATH (and I'm pretty sure I didn't uncheck the box for it at the end of the installation).

I did the same procedure on some XP and Windows 7 machines earlier this week without any problems, so i caught me a bit by surprise.

If you have no other Python installation on your machine, you can check if running 'python' (type win-key + r, or do it from command prompt) works. If it doesn't, simply add your main installation directory (where python.exe is located) to your PATH variable.

If this doesn't work you could use Dependency Walker to check which DLL the error message is actually about, and then see if that DLL is present somewhere within your PATH or PYTHONPATH.

I have had the same DLL error when multiple versions of the same DLL were compiled with different compilers and the required version wasn't found first. If removing a version (the program it came with) isn't an option, changing the order of your PATH variable can help.