Question

This is probably a super easy question, but I just wanted to make 10000% sure before I did it.
Basically Im doing a formula for a program, it takes some certain values and does things when them…..etc..

Anyways Lets say I have some values called:

N
Links_Retrieved
True_Links
True_Retrieved.

I also have a % “scalar” ill call it, for this example lets say the % scalar is 10%.

Links Retrieved is ALWAYS half of N, so that’s easy to calculate.
BUT I want True_Links to be ANYWHERE from 1-10% of Links_Retrieved.

Then I want True_Retrieved to be anywhere from The True_Links to 15% of Links_Retrieved.
How would I do this? would it be something like

True_Link=(((rand()%(Scalar(10%)-1))+1)/100);

?
I would divide by 100 to get the “percent” value IE .1 so it’s be anywhere from .01 to .1?

and to do the True_retrieved it’d be

True_Retrieved=(rand()%(.15-True_Link))+True_Link;

am I doing this correct or am I WAYYYY off?
thanks

Answer 1

rand() is a very simple Random Number Generator. The Boost libraries include Boost.Random. In addition to random number generators, Boost.Random provides a set of classes to generate specific distirbutions. It sounds like you would want a distribution that’s random between 1% and 10%, i.e. 0.01 and 0.1. That’s done with boost::random::uniform_real(0.01, 0.1).