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UNIX export command [closed]
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Unix
The commands env, set, and printenv display all environment variables and their values. env and set are also used to set environment variables and are often incorporated directly into the shell. printenv can also be used to print a single variable by giving that variab...
Filtering a data frame by values in a column [duplicate]
...nce we don't want to restrict which columns we get for those rows (we want all of them), we leave the column part of the index pair blank (so there's nothing after the comma). This is syntactic sugar to avoid having to give a vector of all column indices.
– Will
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Autoresizing masks programmatically vs Interface Builder / xib / nib
...ewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin;
All to often I see these margins OR'ed together on one line like the example above. Just hard to read.
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Conditionally Remove Dataframe Rows with R [duplicate]
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Actually, a simpler way of viewing it is: foo.isolated <- subset(foo, !(sid == "sid104" & game.num == 7))
– WGray
Aug 6 '15 at 21:01
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jQuery .on function for future elements, as .live is deprecated [duplicate]
... click event of future <div> elements, that don't exist yet. Normally, I would use jQuery's .live function to handle this, but it seems that it is now deprecated in favor of .on .
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How to get the browser language using JavaScript [duplicate]
...hrome's navigator.language is always the language configuration of the installation of windows, rather than the language configuration of the browser.
– kybernetikos
Jul 31 '13 at 14:04
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Css height in percent not working [duplicate]
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You need to set a 100% height on all your parent elements, in this case your body and html. This fiddle shows it working.
html, body { height: 100%; width: 100%; margin: 0; }
div { height: 100%; width: 100%; background: #F52887; }
<html><body...
What’s the purpose of prototype? [duplicate]
...-created each time; it exists in one place in the prototype. So when you call someAnimal.set_name("Ubu"); the this context will be set to someAnimal and (the one and only) set_name function will be called.
There is one advantage to using the first syntax though: functions created in this manner...
How to calculate the intersection of two sets? [duplicate]
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Use the retainAll() method of Set:
Set<String> s1;
Set<String> s2;
s1.retainAll(s2); // s1 now contains only elements in both sets
If you want to preserve the sets, create a new set to hold the intersection:
Set<String&g...
Why doesn't calling a Python string method do anything unless you assign its output?
... line:
X = X.replace("hello", "goodbye")
More broadly, this is true for all Python string methods that change a string's content "in-place", e.g. replace,strip,translate,lower/upper,join,...
You must assign their output to something if you want to use it and not throw it away, e.g.
X = X.strip...