Return the base 10 logarithm of the input array, element-wise.
Parameters:x : array_like
Returns:Input values.
y : ndarray
The logarithm to the base 10 of x, element-wise. NaNs are returned where x is negative.
Notes
Logarithm is a multivalued function: for each x there is an infinite number of z such that 10**z = x. The convention is to return the z whose imaginary part lies in [-pi, pi].
For real-valued input data types, log10 always returns real output. For each value that cannot be expressed as a real number or infinity, it yields nan and sets the invalid floating point error flag.
For complex-valued input, log10 is a complex analytical function that has a branch cut [-inf, 0] and is continuous from above on it. log10 handles the floating-point negative zero as an infinitesimal negative number, conforming to the C99 standard.
References
Examples
>>> np.log10([1e-15, -3.]) array([-15., NaN])
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