koobas.hobune.stream
Is Random.Range() Really Maximally Inclusive?
According to the C# documentation, "Returns a random float number between and min [inclusive] and max [inclusive]." However, after running a few tests, it appears as though the max is actually exclusive. Something as simple as Debug.Log (Random.Range (1, 4); never seems to return 4. Now is this some sort of error on my part, or is the documentation simply mistaken?
Try using Random.Range (0,1). $$anonymous$$aybe you are just unlucky :)
Only Range with float is maximally inclusive.
Range with integer is not maximally inclusive.
Of course! I can't believe I didn't notice that. Thank you!
Actually as of Unity 5, this is no longer the case. Both versions are documented as maximally exclusive. Haven't tested to verify but that's a subtle change that can cause some interesting statistical issues for existing code.
It's no longer the case. Tested and verified.
It still is the case and I'm on the latest Unity 5.3 build. If I write Random.Range(0, 2) only 0 or 1 get chosen
You can use this: Random.Range (0.0, 1.0)
No point if he needs integers. He can just use range of 2.
List<int> x = new List<int>();
x.Add(1);
x.add(100);
x.add(1000);
int i;
for(int i = 0; i < 100; i++)
{
i = Random.Range(0, (x.Count));
Debug.Log("i=" + i );
}
Always equals 0 to 2, never 3.
What was the point of this? Also your code is quite broken.
EDIT: I was mistaken. Further down in the documentation page, it does clearly lay out that max for ints are exclusive, while max for floats are inclusive. I hadn't looked further.
I'm looking at https://docs.unity3d.com/ScriptReference/Random.Range.html which states quite specifically at the top of the Description:
Return a random float number between min [inclusive] and max [inclusive] (Read Only).
Note max is inclusive. Random.Range(0.0f, 1.0f) can return 1.0 as the value.
I'm using it for integers, which testing shows has an inclusive min and exclusive max. Perhaps it's different with floats, but the documentation confused me.
