xray.ufuncs.log10(*args, **kwargs)

xray specific variant of numpy.log10. Handles xray.Dataset, xray.DataArray, xray.Variable, numpy.ndarray and dask.array.Array objects with automatic dispatching.

Documentation from numpy:

log10(x[, out])

Return the base 10 logarithm of the input array, element-wise.


x : array_like

Input values.


y : ndarray

The logarithm to the base 10 of x, element-wise. NaNs are returned where x is negative.

See also



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.


[R35]M. Abramowitz and I.A. Stegun, “Handbook of Mathematical Functions”, 10th printing, 1964, pp. 67. http://www.math.sfu.ca/~cbm/aands/
[R36]Wikipedia, “Logarithm”. http://en.wikipedia.org/wiki/Logarithm


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