Cant believe i have to ask this

The documentation is so absurdly poor for Mathcad i cant believe i have to ask this and or cant find it on the web.

How do you access data in an array!

I want to create a simple vector and then access bits of it later!! i can not believe this syntax is not available

Array(100,100):= 0

then i simply want to read or write to say element 1X1

So i want to display

Array(1,1) =  0 

And have it show zero

Why is everything 10 times harder with mathcad then it needs to be.