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Formula to determine brightness of RGB color
I'm looking for some kind of formula or algorithm to determine the brightness of a color given the RGB values. I know it can't be as simple as adding the RGB values together and having higher sums be brighter, but I'm kind of at a loss as to where to start.
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How to kill all processes matching a name?
...names.
– user79878
Feb 12 '14 at 20:05
It will fail if the are not matches for pgrep
– alfredoca...
How can I pipe stderr, and not stdout?
...
Or to swap the output from standard error and standard output over, use:
command 3>&1 1>&2 2>&3
This creates a new file descriptor (3) and assigns it to the same place as 1 (standard output), then assigns fd 1 (standard output) to the sa...
Create a variable name with “paste” in R?
See below:
4 Answers
4
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How do I sort a list of dictionaries by a value of the dictionary?
...…
– Permafacture
Aug 23 '13 at 21:05
15
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How do I choose a HTTP status code in REST API for “Not Ready Yet, Try Again Later”? [closed]
...in some fashion not available to the client. This should be treated as an error so no 2XX code is appropriate. Something in the 4XX or 5XX space. The request has not "been accepted for processing", the request is in practice being discarded
– Adam
Oct 21 '18...
How can I view the source code for a function?
...y the partial signature
getMethod("extract",signature="SpatialPolygons")
#Error in getMethod("extract", signature = "SpatialPolygons") :
# No method found for function "extract" and signature SpatialPolygons
Functions that call unexported functions
In the case of ts.union, .cbindts and .makeNa...
How do I cancel a build that is in progress in Visual Studio?
... Studio on one of my projects (I turn MVC view building on to catch markup errors), well, the project becomes unresponsive while building. I can't cancel the build using the keyboard shortcuts.
So I made this batch file that sits on my quick launch task bar.
@echo off
echo KILL BILLd
for /L %%i in...
PHP + MySQL transactions examples
... rollback the transaction
$db->rollback();
throw $e; // but the error must be handled anyway
}
Note that, with this idea, if a query fails, an Exception must be thrown:
PDO can do that, depending on how you configure it
See PDO::setAttribute
and PDO::ATTR_ERRMODE and PDO::ERRMODE_EXCE...
GPU Emulator for CUDA programming without the hardware [closed]
...ved in a future release.
/usr/include/i386-linux-gnu/bits/byteswap.h(47): error: identifier "__builtin_bswap32" is undefined
/usr/include/i386-linux-gnu/bits/byteswap.h(111): error: identifier "__builtin_bswap64" is undefined
/home/user/Downloads/helloworld.cu(12): error: identifier "cudaDeviceSy...