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How can one print a size_t variable portably using the printf family?
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@Christoph: Nor is it in the latest draft, n3035.
– GManNickG
Mar 26 '10 at 16:48
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numpy: most efficient frequency counts for unique values in an array
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@Manoj : My elements x are arrays. I am testing the solution of jme.
– Catalina Chircu
Feb 13 at 11:04
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What is “callback hell” and how and why does RX solve it?
...ions we get here on StackOverflow asking how to do this kind of thing is a testament to how confusing it is :)
3) Why does it occur ?
It occurs because in JavaScript the only way to delay a computation so that it runs after the asynchronous call returns is to put the delayed code inside a callback...
Database Design for Tagging
...hilippkeller.com/2005/04/24/Tags-Database-schemas/
along with performance tests:
http://howto.philippkeller.com/2005/06/19/Tagsystems-performance-tests/
Note that the conclusions there are very specific to MySQL, which (at least in 2005 at the time that was written) had very poor full text indexi...
How to know if two arrays have the same values
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Array.prototype.compare = function(testArr) {
if (this.length != testArr.length) return false;
for (var i = 0; i < testArr.length; i++) {
if (this[i].compare) { //To test values in nested arrays
if (!this[i].compare(testArr[i])) ...
Can I use CASE statement in a JOIN condition?
...it to 1. Your statement attempted to return the value of an assignment or test for equality, neither of which make sense in the context of a CASE/THEN clause. (If BOOLEAN was a datatype then the test for equality would make sense.)
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Filter rows which contain a certain string
...str", "", object) # -> "ingr"
Benchmark
The results of the benchmark test are as follows. For large dataframe, str_detect is faster.
library(rbenchmark)
library(tidyverse)
# The data. Data expo 09. ASA Statistics Computing and Graphics
# http://stat-computing.org/dataexpo/2009/the-data.html...
Rank items in an array using Python/NumPy, without sorting array twice
... there was a solution and it would seem obvious once I saw it. I did some testing with timeit, and this method is slightly slower for small arrays. On my machine they're equal when the array has 2,000 elements. At 20,000 elements, your method is about 25% faster.
– joshayers...
How to convert a SVG to a PNG with ImageMagick?
...me using: /Applications/Inkscape.app/Contents/Resources/bin/inkscape -z -e test.png -w 1024 -h 1024 test.svg
– chmullig
Mar 14 '14 at 0:26
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#ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular s
...here's why:
First, you can use DEBUG_ENABLED in preprocessor and compiled tests. Example - Often, I want longer timeouts when debug is enabled, so using #if, I can write this
DoSomethingSlowWithTimeout(DEBUG_ENABLED? 5000 : 1000);
... instead of ...
#ifdef DEBUG_MODE
DoSomethingSlowWithTime...