How can I take the square root of -1 using python?

Question

When I take the square root of -1 it gives me an error:

invalid value encountered in sqrt

How do I fix that?

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Answer 1

The square root of -1 is not a real number, but rather an imaginary number. IEEE 754 does not have a way of representing imaginary numbers.

numpy has support for complex numbers. I suggest you use that: http://docs.scipy.org/doc/numpy/user/basics.types.html