# Apply log to sample columns **URL:** \ **Category:** Python usage\ **Created:** [January 9, 2023, 9:25am UTC](https://openturns.discourse.group/t/apply-log-to-sample-columns/263 "2023-01-09T09:25:24Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Claire-Eleutheriane](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/claire-eleutheriane/32/246_2.png) [@Claire-Eleutheriane](https://openturns.discourse.group/u/Claire-Eleutheriane)\ **Post date:** [January 9, 2023, 9:25am UTC](https://openturns.discourse.group/t/apply-log-to-sample-columns/263/1 "2023-01-09T09:25:24Z")
Hi, I want to apply a log transformation to some columns of a sample. Is there a direct way to do this (in-place if possible)? In pandas, this would be: df[list\_log\_input] = np.log(df[list\_log\_input]) Thanks 👍 ---
**Author:** ![schueller](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/schueller/32/3_2.png) [@schueller](https://openturns.discourse.group/u/schueller)\ **Post date:** [January 11, 2023, 10:14am UTC](https://openturns.discourse.group/t/apply-log-to-sample-columns/263/2 "2023-01-11T10:14:48Z")
hi, its not possible currently, but good news ot.Sample has methods for interoperability with pandas.df: [http://openturns.github.io/openturns/latest/auto\_data\_analysis/manage\_data\_and\_samples/plot\_sample\_pandas.html](http://openturns.github.io/openturns/latest/auto_data_analysis/manage_data_and_samples/plot_sample_pandas.html) ---
**Author:** ![Claire-Eleutheriane](https://yyz2.discourse-cdn.com/free1/user_avatar/openturns.discourse.group/claire-eleutheriane/32/246_2.png) [@Claire-Eleutheriane](https://openturns.discourse.group/u/Claire-Eleutheriane)\ **Post date:** [January 11, 2023, 10:49am UTC](https://openturns.discourse.group/t/apply-log-to-sample-columns/263/3 "2023-01-11T10:49:56Z")
Nice changes ! Thanks for the advice.