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Weighted random numbers
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1) calculate the sum of all the weights
2) pick a random number that is 0 or greater and is less than the sum of the weights
3) go through the items one at a time, subtracting their weight from your random number, until you get the item where the random number is less than that item's weight
Ps...
How to loop backwards in python? [duplicate]
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302
range() and xrange() take a third parameter that specifies a step. So you can do the following....
Logging errors in ASP.NET MVC
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103
I would consider simplifying your web application by plugging in Elmah.
You add the Elmah asse...
MongoDB inserts float when trying to insert integer
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db.data.update({'name': 'zero'}, {'$set': {'value': NumberInt(0)}})
You can also use NumberLong.
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How to get a list of properties with a given attribute?
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answered Feb 17 '10 at 16:09
Marc Gravell♦Marc Gravell
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How to automatically generate a stacktrace when my program crashes
...b.h>
#include <unistd.h>
void handler(int sig) {
void *array[10];
size_t size;
// get void*'s for all entries on the stack
size = backtrace(array, 10);
// print out all the frames to stderr
fprintf(stderr, "Error: signal %d:\n", sig);
backtrace_symbols_fd(array, size, STDE...
How to throw a C++ exception
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#include <stdexcept>
int compare( int a, int b ) {
if ( a < 0 || b < 0 ) {
throw std::invalid_argument( "received negative value" );
}
}
The Standard Library comes with a nice collection of built-in exception objects you can throw. Keep in mind that you should always...
Creating a JavaScript cookie on a domain and reading it across sub domains
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209
Just set the domain and path attributes on your cookie, like:
<script type="text/javascript...
Iterate through the fields of a struct in Go
....ValueOf(x)
values := make([]interface{}, v.NumField())
for i := 0; i < v.NumField(); i++ {
values[i] = v.Field(i).Interface()
}
fmt.Println(values)
}
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Write to .txt file?
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270
FILE *f = fopen("file.txt", "w");
if (f == NULL)
{
printf("Error opening file!\n");
exit...