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Measure time in Linux - time vs clock vs getrusage vs clock_gettime vs gettimeofday vs timespec_get?
...on the wall (or desktop).
Here's what I've found so far for clocks in Linux and OS X:
time() returns the wall-clock time from the OS, with precision in seconds.
clock() seems to return the sum of user and system time. It is present in C89 and later. At one time this was supposed to be the CPU tim...
Why does Clojure have “keywords” in addition to “symbols”?
...and functions and it's less common to manipulate them as objects directly except in macros and such. But there's nothing stopping you from using a symbol everywhere you use a keyword (if you don't mind quoting them all the time).
The easiest way to see the difference is to read Keyword.java and Sy...
Warning: Null value is eliminated by an aggregate or other SET operation in Aqua Data Studio
....
whilst being used with a left join, where the counted object does not exist.
Using COUNT(*) in this case would also render incorrect results, as you would then be counting the total number of results (ie parents) that exist.
Using COUNT([uid]) IS a valid way of counting, and the warning is not...
How do I create and read a value from cookie?
...d retrieving cookies.
function createCookie(name, value, days) {
var expires;
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = "; expires=" + date.toGMTString();
}
else {
expires = "";
}
...
Is there a bash command which counts files?
... I would not use ls, since it creates a child process. log* is expanded by the shell, not ls, so a simple echo would do.
– cdarke
Jul 3 '12 at 9:24
2
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Replacement for “rename” in dplyr
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Could you explain the syntax? That's more important than the command. I'm using rename(TheDataFrame,OldVarName=NewVarName) but I get Error: Unknown variables: NewVarName. and I don't understand why.
– s_a
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How does the const constructor actually work?
...st constructor creates a "canonicalized" instance.
That is, all constant expressions begin canonicalized, and later these "canonicalized" symbols are used to recognize equivalence of these constants.
Canonicalization:
A process for converting data that has more than one possible representation in...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
Why does the C preprocessor in GCC interpret the word linux (small letters) as the constant 1 ?
5 Answers
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character showing up in files. How to remove them?
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perl -pi~ -CSD -e 's/^\x{fffe}//' file1.js path/to/file2.js
I would assume the tool will break if you have other utf-8 in your files, but if not, perhaps this workaround can help you. (Untested ...)
Edit: added the -CSD option, as per tchrist's ...
Determine distance from the top of a div to top of window with javascript
...the very top of a div to the top of the current screen? I just want the pixel distance to the top of the current screen, not the top of the document. I've tried a few things like .offset() and .offsetHeight , but I just can't wrap my brain around it. Thanks!
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