Will Random always be the same on every computer?

[jahuol8]

Will Random numbers (with the same inputs) always be the same, no matter which computer/system/grasshopper version I’m using?

[jaymezd (James Dalessandro)]

It at least appears to be the same between different GH versions on the same Windows 10 computer.

[kev.r (Kevin)]

If you want a different set of numbers, you can change the seed input. You can use a seed based on the current time to get a different set of numbers each time you run your script.

Here’s a couple of examples:

Real random numbers

I made a little script with output a millisecond date [image] Inside it didn’t use the X, just do that DateTime localDate = DateTime.Now; _ A = localDate.Millisecond;_ But there is an update each time you click on toggle. random seed2.gh (5.3 KB)

Populating a surface with points randomly each time

You need to change the Seed(S) input. This could be with an integer slider, and you move it when you want a different solution… or if you want it to automatically generate different values each time the solution is refreshed, you could do it with a script like this that uses the current system time. Then it will change whenever you press f5 to refresh your solution. [image]

-Kevin

[jahuol8]

not really, I need to know, if I sent the same .gh file to many people, would they have the same random numbers output, or is it dependent on software/hardware they use?

[laurent_delrieu]

Hello
I don’t find the discussion but I think David Rutten said it was .NET random.
And I tested it, it is.Net random
See this script 20000 randoms, no differences

random NET vs GH.gh (8.9 KB)

Random Classe (System)

https://blogs.siliconorchid.com/post/coding-inspiration/randomness-in-dotnet/

[kev.r (Kevin)]

I believe the answer to your question is yes. With the same inputs to the Random component, they will get the same outputs.

I get the same results as @jaymezd on the MacOS version of Rhino/Grasshopper (with the same inputs).

-Kevin