Is there a one-line function that generates a triangle wave?

Question

In a similar way that modulo generates a sawtooth wave. It doesn\'t have to be continuous.

here is what i mean:

int m = 10;
int x = 0;
int i         


        

Answer 1

Here is a periodic function that looks like a distant sine approximation; essentially it's a Sinuating paraboloid, using X squared:

function  xs ( xx : float ): float{

    var xd =Mathf.Abs((Mathf.Abs(xx) % 2.4) - 1.2);

    if (  Mathf.Abs(Mathf.Abs(xx) % 4.8)  > 2.4){ 
        xd=(-xd*xd)+2.88;
    }else{
        xd = xd*xd;
    }

    return xd;

}