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How to join (merge) data frames (inner, outer, left, right)
...nner join: merge(df1, df2) will work for these examples because R automatically joins the frames by common variable names, but you would most likely want to specify merge(df1, df2, by = "CustomerId") to make sure that you were matching on only the fields you desired. You can also use the by.x and b...
Maven artifact and groupId naming
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reverse-domain-packages for groupId (since such are quite unique) with all the constrains regarding Java packages names
project name as artifactId (keeping in mind that it should be jar-name friendly i.e. not contain characters that maybe invalid for a file name or just look weird)
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Align labels in form next to input
...technology has made for what I think is a better solution. CSS Grid Layout allows us to structure a more elegant solution.
The CSS below provides a 2-column "settings" structure, where the first column is expected to be a right-aligned label, followed by some content in the second column. More comp...
Make: how to continue after a command fails?
The command $ make all gives errors such as rm: cannot remove '.lambda': No such file or directory so it stops. I want it to ignore the rm-not-found-errors. How can I force-make?
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How to check if type of a variable is string?
...atter, because Python 3.x is not meant to be compatible with Python 2.x at all.
– netcoder
Jul 15 '13 at 17:45
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Explicit vs implicit SQL joins
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So-called "implicit joins" of the 'inner' or 'cross' variety remain in the Standard. SQL Server is deprecating the "old-style" outer join syntax (i.e. *= and =*) which has never been Standard.
– onedaywhen
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How do I shutdown, restart, or log off Windows via a bat file?
... -l — Logs off.
shutdown -h — Hibernates.
Note: There is a common pitfall wherein users think -h means "help" (which it does for every other command-line program... except shutdown.exe, where it means "hibernate"). They then run shutdown -h and accidentally turn off their computers. Watch out f...
How can I get Knockout JS to data-bind on keypress instead of lost-focus?
...meters
valueUpdate
If your binding also includes a parameter called valueUpdate, this
defines which browser event KO should use to detect changes. The
following string values are the most commonly useful choices:
"change" (default) - updates your view model when the user
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My images are blurry! Why isn't WPF's SnapsToDevicePixels working?
..."True".
A property previously only available in Silverlight has now fixed all Bitmap sizing woes. :)
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How can I convert a comma-separated string to an array?
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Best practice for support all types of strings. See here stackoverflow.com/a/32657055/2632619
– Andi AR
Sep 18 '15 at 16:46
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