python - Can't figure out why numpy.log10 outputs nan? -


so have 500k array of floating values. when trying to:

np.log10(my_long_array)

270k numbers getting replaced nan, , not small. example:

in [1]: import numpy np  in [2]: t = -0.055488893531690543  in [3]: np.log10(t) /home/aydar/anaconda3/bin/ipython:1: runtimewarning: invalid value encountered in log10   #!/home/aydar/anaconda3/bin/python3 out[3]: nan  in [4]: type(t) out[4]: float

what missing?

the logarithm of negative number undefined, hence nan

from docs numpy.log10:

returns: y : ndarray

the logarithm base 10 of x, element-wise. nans returned x negative.


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