.SDcols accepts a function to filter on values - #3991
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mattdowle merged 3 commits intoDec 20, 2019
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@@ Coverage Diff @@
## master #3991 +/- ##
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+ Coverage 99.41% 99.41% +<.01%
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Files 72 72
Lines 13904 13909 +5
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+ Hits 13823 13828 +5
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renkun-ken
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Jul 21, 2020
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NEWS.md
| # data.table::fcase 1.49 1.55 1.67 1.71 1.73 1.86 5 | ||
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| 7. `.SDcols=is.numeric` now works; i.e., `SDcols=` accepts a function which is used to select the columns of `.SD`, [#3950](https://github.com/Rdatatable/data.table/issues/3950). Any function (even _ad hoc_) that returns scalar `TRUE`/`FALSE` for each column will do; e.g., `.SDcols=!is.character` will return _non_-character columns (_a la_ `Negate()`). Note that `patterns=` can still be used for filtering based on the column names. |
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patterns= looks a bit misleading to me, looks like an argument of [, e.g. dt[i, lapply(.SD, mean), patterns="^x"].
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Good spot. I filed to #4642 to fix that.
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mattdowle
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Closes #3950