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How to delete a row by reference in data.table?
...nce yet.
data.table can add and delete columns by reference since it over-allocates the vector of column pointers, as you know. The plan is to do something similar for rows and allow fast insert and delete. A row delete would use memmove in C to budge up the items (in each and every column) after t...
Preserve Line Breaks From TextArea When Writing To MySQL
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Two solutions for this:
PHP function nl2br():
e.g.,
echo nl2br("This\r\nis\n\ra\nstring\r");
// will output
This<br />
is<br />
a<br />
string<br />
Wrap the input in <pre></pre> tags.
See: W3C Wiki - HTML/El...
Multiple arguments to function called by pthread_create()?
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main() has it's own thread and stack variables. either allocate memory for 'args' in the heap or make it global:
struct arg_struct {
int arg1;
int arg2;
}args;
//declares args as global out of main()
Then of course change the references from args->arg1 to args.arg...
Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor imple
...sing work. In your char[] array example, the array of the required size is allocated in advance. In your vector and ostringstream example you are forcing the objects to repeatedly allocate and reallocate and possibly copy data many times as the object grows.
With std::vector this is easly resolved...
How do I copy the contents of one stream to another?
...d that 4096 is actually faster than 32K. Something to do with how the CLR allocates chunks over a certain size. Because of this, the .NET implementation of Stream.CopyTo apparently uses 4096.
– Jeff
Feb 18 '12 at 0:03
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Objective-C class -> string like: [NSArray className] -> @“NSArray”
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Class arrayClass = NSClassFromString (name);
id anInstance = [[arrayClass alloc] init];
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Import text file as single character string
...foo.txt'
readChar(fileName, file.info(fileName)$size)
Note that readChar allocates space for the number of bytes you specify, so readChar(fileName, .Machine$integer.max) does not work well...
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How can I use a carriage return in a HTML tooltip?
... @Tarquin They don't work in HTML, they just work specifically in PHP's double quotes because that's a feature of PHP's double quotes.
– Brilliand
May 26 '15 at 19:11
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Java8 Lambdas vs Anonymous classes
...st don't try to use your counter from multiple threads. If you're going to allocate something on the heap and capture it in a lambda, you might as well use an AIC and add a field that you can mutate directly. Using a lambda this way can work, but why bother when you can use a real object?
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Fast permutation -> number -> permutation mapping algorithms
... {
bNoSymbol = false;
}
// allocate output storage
this.iOutPosition = new int[this.rChose];
// initialize the bin slot with the right size
this.slot = new BinSlot(this.nTotal);
// allocate and initiali...