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Natural Logarithm #1558

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Far0n opened this issue Jan 15, 2019 · 0 comments · Fixed by #1566
Closed

Natural Logarithm #1558

Far0n opened this issue Jan 15, 2019 · 0 comments · Fixed by #1566
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@st-pasha
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Release 0.8.0

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@Far0n
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Far0n commented Jan 15, 2019

It would be nice to have the equivalent of np.log().
@st-pasha st-pasha mentioned this issue Jan 17, 2019
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st-pasha added a commit that referenced this issue Jan 17, 2019
@st-pasha
Implement the logarithm functions (#1566)
da3b827 
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 added this to the Release 0.8.0 milestone Jan 17, 2019
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Implement the logarithms functions h2oai/datatable
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@st-pasha @Far0n