how can i change a variable value from other script?

i need to change player speed from other script how can i do that?

 

You get a reference to the instance of the script and then make the change. There's a variety of ways to get that reference, which there's lots of threads discussing so I won't rehash them all here.

But as a quick example, assume you have a MonoBehaviour called PlayerScript with a public Speed float, and you set your reference to it in the inspector. Your code in the other script could look something like this:

Code (csharp):

1. public PlayerScript PlayerScriptInstance;  //Reference to PlayerScript set in the inspector
2.  
3. private void changeSpeed(float newSpeed)
4. {
5.     PlayerScriptInstance.Speed = newSpeed;
6. }