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How to create a temporary directory/folder in Java?
...the proposed adaptation of File.createTempFile("install", "dir") typically introduces security vulnerabilities.
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Create ArrayList from array
...low in Alex Miller's answer, using Arrays.asList(array) without passing it into a new ArrayList object will fix the size of the list. One of the more common reasons to use an ArrayList is to be able to dynamically change its size, and your suggestion would prevent this.
– Code ...
Aggregate / summarize multiple variables per group (e.g. sum, mean)
...[, lapply(.SD, sum), by=.(year, month), .SDcols=c("x1","x2")]
setDF(df2) # convert back to dataframe
Using the plyr package
require(plyr)
df2 <- ddply(df1, c("year", "month"), function(x) colSums(x[c("x1", "x2")]))
Using summarize() from the Hmisc package
(column headings are messy in my ex...
Java - escape string to prevent SQL injection
...e the "replaceAll" string function. Ultimately I need a function that will convert any existing \ to \\ , any " to \" , any ' to \' , and any \n to \\n so that when the string is evaluated by MySQL SQL injections will be blocked.
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Sending multipart/formdata with jQuery.ajax
...ust leave the processData flag set to false, otherwise, jQuery will try to convert your FormData into a string, which will fail.
You may now retrieve the file in PHP using:
$_FILES['file-0']
(There is only one file, file-0, unless you specified the multiple attribute on your file input, in which...
Python: Append item to list N times
... reason why the first method is only a good idea for constant values, like ints or strings, is because only a shallow copy is does when using the <list>*<number> syntax, and thus if you did something like [{}]*100, you'd end up with 100 references to the same dictionary - so changing one...
What is the use of the pipe symbol in YAML?
...dicates that multi-line "folded" scalar follows, meaning that newlines are converted to spaces. For example:
>>> import yaml
>>> yaml.load("""
... |
... This is a multi-line
... literal style scalar.
... """)
'This is a multi-line\nliteral style scalar.\n'
>>> yaml.loa...
Is it possible to use argsort in descending order?
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@user3666197 Yes, that's a good point - if an array is taking up 50% available memory, we will certainly want to avoid copying it and causing swapping. I'll edit again to mention that a copy is created there.
– wim
Aug...
How to change href of tag on button click through javascript
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no href makes it an anchor, click converts to a link, pretty normal
– Free Consulting
Dec 6 '10 at 12:07
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Worth switching to zsh for casual use? [closed]
...s not clear that zmv is just renaming files; I thought you might have been converting the format. I don't know what "hashes" support even means. This post seems like it's only "useful" to people that already know zsh.
– mpen
Mar 26 '14 at 17:52
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