python - 'invalid value encountered in double_scalars' warning, possibly numpy

Question

As I run my code I get these warnings, always in groups of four, sporadically. I have tried to locate the source by placing debug messages before and after certain statements to pin-point its origin.

Warning: invalid value encountered in double_scalars
Warning: invalid value encountered in double_scalars
Warning: invalid value encountered in double_scalars
Warning: invalid value encountered in double_scalars

Is this is a Numpy warning, and what is a double scalar?

From Numpy I use

min(), argmin(), mean() and random.randn()

I also use Matplotlib

Answer 1

In my case, I found out it was division by zero.