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What does the “>” (greater-than sign) CSS selector mean?
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Numbering rows within groups in a data frame
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284
Use ave, ddply, dplyr or data.table:
df$num <- ave(df$val, df$cat, FUN = seq_along)
or:
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Spring .properties file: get element as an Array
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189
If you define your array in properties file like:
base.module.elementToSearch=1,2,3,4,5,6
Yo...
How to pull a random record using Django's ORM?
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Emil IvanovEmil Ivanov
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Validating IPv4 addresses with regexp
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answered Mar 12 '11 at 18:08
Mark ByersMark Byers
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Select second last element with css
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edited Feb 15 '18 at 16:18
Kos
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iTerm2 keyboard shortcut - split pane navigation
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lucasoldaini
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answered Feb 12 '12 at 3:47
Michael BerkowskiMichael Berkowski
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How to ignore files which are in repository?
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189
If the file is still displayed in the status, even though it is in the .gitignore, make sure it...
PHP namespaces and “use”
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edited Jun 28 '18 at 7:07
Tomas Prado
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Explain the “setUp” and “tearDown” Python methods used in test cases
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86
In general you add all prerequisite steps to setUp and all clean-up steps to tearDown.
You can...