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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
.../ Starting the time measurement
double start = omp_get_wtime();
// Computations to be measured
while(inptr != endptr)
{
(*outptr) = reverse(*inptr);
inptr++;
outptr++;
}
// Measuring the elapsed time
double end = omp_get_wtime();
// Time calculation ...
Adding parameter to ng-click function inside ng-repeat doesn't seem to work
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ADB Shell Input Events
... inputting a character? Are the keycodes the same that we pass to both the commands?
8 Answers
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How to add to the PYTHONPATH in Windows, so it finds my modules/packages?
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91
From Windows command line:
set PYTHONPATH=%PYTHONPATH%;C:\My_python_lib
To set the PYTHONPAT...
Virtual functions and performance - C++
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171
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Moving decimal places over in a double
...0000000000000005551115123125782702118158340454101562
12.339999999999999857891452847979962825775146484375
In short, rounding is unavoidable for sensible answers in floating point whether you are doing this explicitly or not.
Note: x / 100 and x * 0.01 are not exactly the same when it comes to ro...
How to pip install a package with min and max version range?
...package>=0.2,<0.3" is a much better example, because it reflects the common case of saying: "please give me the latest bugfix release of the current minor version, but don't automatically upgrade me to the next minor version, because I would like to do that explicitly, making sure that there a...
Determine path of the executing script
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hadleyhadley
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What is the string length of a GUID?
...1111111111111111111111111111111111111111111 (binary, base 2) or
0 through 91"<b.PX48m!wVmVA?1y (base 95)
So yes, min 20 characters long, which is actually wasting more than 4.25 bits, so you can be just as efficient using smaller bases than 95 as well; base 85 being the smallest possible one t...
PostgreSQL Crosstab Query
... CASE and GROUP BY
\crosstabview in psql
Postgres 9.6 added this meta-command to its default interactive terminal psql. You can run the query you would use as first crosstab() parameter and feed it to \crosstabview (immediately or in the next step). Like:
db=> SELECT section, status, ct FRO...