How do I wright this function

How do I wright this function on matlab as the For all component is confusing me ?

[darova]

Can you please show your attempts? What have you tried? DO you have any idea how to implement it?

[Rik]

It looks like the function definition is different from what seems the intention. This function is only defined for t up to 1. I suspect the intended definition for the second line is f(t)=f(abs(t)-2) for all t<-1 or t>=1, which would actually make sure all values of t result in a value.