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How do you reverse a string in place in C or C++?
...ch more complicated the asm loop body is when xor-swap is compiled for x86-64 with gcc -O3.)
Ok, fine, let's fix the UTF-8 chars...
(This is XOR-swap thing. Take care to note that you must avoid swapping with self, because if *p and *q are the same location you'll zero it with a^a==0. XOR-swap ...
Tricks to manage the available memory in an R session
... some of them. But by far the most effective solution was ... to run under 64-bit Linux with ample memory.
27 Answers
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How do I set the default locale in the JVM?
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lucasmolucasmo
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Generating random strings with T-SQL
... , @first varchar(8000)
declare @step bigint = rand(@seed) * 2147483647;
select @alpha = 'qwertyuiopasdfghjklzxcvbnm'
, @digit = '1234567890'
, @specials = '_@# '
select @first = @alpha + '_@';
set @seed = (rand((@seed+@step)%2147483647)*2147483647);
select...
#pragma pack effect
...it on a 7 byte boundary will hurt performance. But putting it on a 16, 32, 64 or 4096 byte boundary buys you nothing above what the 8 byte boundary already gave you. You'll get the same performance from the CPU, while getting much worse cache utilization for the reasons outlined in that post.
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How to install a specific version of a ruby gem?
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ruby | 1:1.9.3 | http://ftp.uk.debian.org/debian/ wheezy/main amd64 Packages
ruby | 4.5 | http://ftp.uk.debian.org/debian/ squeeze/main amd64 Packages
Then install it:
$ sudo apt-get install ruby=1:1.9.3
To check what's the current version, run:
$ gem --version # Check f...
Upgrading PHP in XAMPP for Windows?
...t to point out that I have my PHP version installed as x86, therefore the x64 versions won't work. It is needed to download the correct portable version of Xampp x86 sourceforge.net/projects/xampp/files/XAMPP%20Windows/7.3.2 - You can check if you have x86 or x64 installed with phpinfo()
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How to determine the memory footprint (size) of a variable?
... not definate. It can depend apparently on the php version and possibly on 64/32 bit.
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What is the maximum float in Python?
...lue of a C long. On some platforms the two values are different: e.g., on 64-bit Windows, sys.maxsize is 2**63-1 and sys.maxint is 2**31-1.
– Mark Dickinson
Aug 14 '10 at 9:29
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