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To find whether a column exists in data frame or not
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11
To get the grepl a bit more precise, you could use grepl("^d$",names(dat)), to ensure that a column with name dd does not return TRUE.
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Grep regex NOT containing string
....4.*Has exploded"
patterns[2]="5\.6\.7\.8.*Has died"
patterns[3]="\!9\.10\.11\.12.*Has exploded"
for i in {1..3}
do
grep "${patterns[$i]}" logfile.log
done
should be the the same as
egrep "(1\.2\.3\.4.*Has exploded|5\.6\.7\.8.*Has died)" logfile.log | egrep -v "9\.10\.11\.12.*Has exploded" ...
How to `go test` all tests in my project?
...t ./... | grep -v /vendor/)
Sources: https://github.com/golang/go/issues/11659, https://github.com/golang/go/issues/14417, https://github.com/go-lang-plugin-org/go-lang-idea-plugin/issues/2366, @nickgrim's comment.
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Using C# reflection to call a constructor
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Jon SkeetJon Skeet
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JavaScript :How to set a Conditional Break Point in Chrome debugger tools
...thing unexpected.
– ejectamenta
Jan 11 '18 at 16:36
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What is the purpose of a plus symbol before a variable?
... Daniel W.
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answered Jul 13 '11 at 17:26
Paul SonierPaul Sonier
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Android icon vs logo
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119
The ActionBar will use the android:logo attribute of your manifest, if
one is provided. T...
How to properly handle a gzipped page when using curl?
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answered Dec 3 '11 at 2:47
MartinMartin
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Get the first N elements of an array?
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corbachocorbacho
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add a comme...
IntelliJ Split Window Navigation
... & Co.
– kevinarpe
Apr 3 '15 at 11:08
Great, thanks. Since I use VIM plugin, I remapped the navigation to CTRL+PgU...