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How can I print a circular structure in a JSON-like format?
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How to change the remote repository for a git submodule?
... does this update the submodule url configuration for the previous commits also? ex if i checkout a older commit, will it point to new submodule urls?
– maxmelbin
Aug 16 '12 at 11:32
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How to sum a variable by group
...e(cbind(x$Frequency, x$Metric2, x$Metric3) ...
(embedding @thelatemail comment), aggregate has a formula interface too
aggregate(Frequency ~ Category, x, sum)
Or if you want to aggregate multiple columns, you could use the . notation (works for one column too)
aggregate(. ~ Category, x, sum)...
Multiline strings in JSON
...at you think your are. Maybe this answer explains it better: stackoverflow.com/a/9295597/359996. Note especially the bit about double escaping.
– user359996
Mar 7 '14 at 17:28
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Colors with unix command “watch”?
Some commands that I use display colors, but when I use them with watch the colors disappears:
6 Answers
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Are static variables shared between threads?
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There isn't anything special about static variables when it comes to visibility. If they are accessible any thread can get at them, so you're more likely to see concurrency problems because they're more exposed.
There is a visibility issue imposed by the JVM's memory model. Here's an ...
ERROR 2006 (HY000): MySQL server has gone away
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You should be able to put this on the command line, which will avoid temporarily editing a system file:<code>mysql --max_allowed_packet=1GM</code>
– Jan Steinman
Feb 13 '15 at 7:45
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Convert to/from DateTime and Time in Ruby
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185
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PHP exec() vs system() vs passthru()
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They have slightly different purposes.
exec() is for calling a system command, and perhaps dealing with the output yourself.
system() is for executing a system command and immediately displaying the output - presumably text.
passthru() is for executing a system command which you wish the ra...
JUnit vs TestNG [closed]
... TestNG groups can be done in JUnit 4.8 with Categories: kentbeck.github.com/junit/doc/ReleaseNotes4.8.html.
– Kaitsu
Feb 1 '10 at 13:16
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