CODEWITHSUNDEEP
pythonnumpyscipy
Elizabeth Susan Joseph
Elizabeth Susan Joseph

Reputation: 6515

Can some one explain me what does np.log do?

I understand that this is a simple question, but I couldnt get what exactly does np.log do? I saw the documentation from which I am not able to understand the logic behind np.log. np.log([9000000]) I am getting the output as 16.01273514. I couldnt understand why I am getting this number, I fo know what a logarithm means.

Upvotes: 2

Views: 11087

Answers (1)

elyase
elyase

Reputation: 40973

np.log(x) is the natural logarithm, i.e. the power to which e would have to be raised to equal x:

>>> np.log([1, np.e, np.e**2, 0])
array([  0.,   1.,   2., -Inf])

Base 10 logarithm:

>>> np.log10([1e-15, -3.])
array([-15.,  NaN])

Base 2 logarithm:

>>> x = np.array([0, 1, 2, 2**4])
>>> np.log2(x)
array([-Inf,   0.,   1.,   4.])

In your example:

>>> np.log([9000000])        # ln(9000000)
array([ 16.01273514])

>>> np.exp([16.01273514])    # e^16
array([ 9000000.04229556])

Upvotes: 8

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