Control random towards a tendency, how?

[CarlGustaffa 4]

In the past I have done a series of case selects in order to control the output of random. Say i.e. I want the mean to be 0.35, with fair chance of getting 0.0 and 0.7 without totally excluding chance of 1.0.

Given this task, how would you approach it?

[samatra 85]

Simplest solution that comes into mind:

private ["_random"];
if(random 2 > 1) then {
_random = random 1; // 0 - 1
} else {
_random = random 0.7; // 0 - 0.7
};

or a shorter variant

_random = random (if(random 2 > 1) then {1} else {0.7});

I'm not into math this much but in this case tendency will be linear, will look something like this

Edited December 25, 2012 by SaMatra