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Rails 3 - can't install pg gem
...g= 'PATH_TO_YOUR_PG_CONFIG'
If you are not sure where your pg_config is, and assuming you are on Linux or Mac, you can run the following command:
which pg_config
Your pg-config can be in different locations depending on how you installed postgres.
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Finding the max value of an attribute in an array of objects
I'm looking for a really quick, clean and efficient way to get the max "y" value in the following JSON slice:
13 Answers
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Python glob multiple filetypes
....glob in python to get a list of multiple file types such as .txt, .mdown, and .markdown? Right now I have something like this:
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Best way to represent a fraction in Java?
...too long ago, for Project Euler problems. It keeps a BigInteger numerator and denominator, so it'll never overflow. But it'll be a tad slow for a lot of operations that you know will never overflow.. anyway, use it if you want it. I've been dying to show this off somehow. :)
Edit: Latest and gre...
How do I make a simple makefile for gcc on Linux?
I have three files: program.c , program.h and headers.h .
5 Answers
5
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Programmatically find the number of cores on a machine
...;sysinfo);
int numCPU = sysinfo.dwNumberOfProcessors;
Linux, Solaris, AIX and Mac OS X >=10.4 (i.e. Tiger onwards)
int numCPU = sysconf(_SC_NPROCESSORS_ONLN);
FreeBSD, MacOS X, NetBSD, OpenBSD, etc.
int mib[4];
int numCPU;
std::size_t len = sizeof(numCPU);
/* set the mib for hw.ncpu */
mib[...
How to create Drawable from resource
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As of API version 21 this method is deprecated and you should be replaced by: Drawable drawable = ResourcesCompat.getDrawable(getResources(), page.getImageId(), null);
– Boren
Apr 14 '15 at 23:07
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Where does the iPhone Simulator store its data?
I have a SQLite DB that I'm using to store app data, and I could do with taking a look inside it to debug a problem I'm having - but where does the iPhone Simulator store its data, typically?
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What is pseudopolynomial time? How does it differ from polynomial time?
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To understand the difference between polynomial time and pseudopolynomial time, we need to start off by formalizing what "polynomial time" means.
The common intuition for polynomial time is "time O(nk) for some k." For example, select...
When is each sorting algorithm used? [closed]
...al keys.
Recommendations:
Quick sort: When you don't need a stable sort and average case performance matters more than worst case performance. A quick sort is O(N log N) on average, O(N^2) in the worst case. A good implementation uses O(log N) auxiliary storage in the form of stack space for re...