NumPy ufuncLesson 36Free preview

ufunc Logs

This lesson is part of NumPy · All levels

Summary

NumPy provides ufunc logarithms: np.log (base e), np.log2 (base 2), and np.log10 (base 10). The logarithm is only defined for positive numbers, so a zero or negative input will produce a warning and a value of NaN/-inf. np.log1p is useful for accurately calculating log(1+x) on very small x.

Key points

It uses an exponential base (e), a base 2, a base 10.
The input must be > 0; log(0) yields -inf and log yields negative NaN.
Np.log1p(x) calculates log(1+x) high precision for small x.
Logarithms are the element-wise operations on the entire array.

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