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Implement the logarithms functions #1566

Merged
merged 2 commits into from Jan 17, 2019
Merged

Implement the logarithms functions #1566

merged 2 commits into from Jan 17, 2019

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st-pasha
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Add functions dt.log() and dt.log10(). For example:

>>> import datatable as dt
>>> X = dt.Frame([1, 2, 3])
>>> X[:, dt.log(dt.f[0])]
           C0
---  --------
 0   0       
 1   0.693147
 2   1.09861 

[3 rows x 1 column]

Closes #1558

@st-pasha st-pasha self-assigned this Jan 17, 2019
@st-pasha st-pasha merged commit da3b827 into master Jan 17, 2019
@st-pasha st-pasha deleted the ln branch January 17, 2019 09:15
@st-pasha st-pasha added this to the Release 0.8.0 milestone Jan 28, 2020
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@oleksiyskononenko oleksiyskononenko oleksiyskononenko approved these changes

@nkalonia1 nkalonia1 Awaiting requested review from nkalonia1

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Natural Logarithm
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@st-pasha @oleksiyskononenko