Dear everyone

I'm trying to create a variable based on matrix conditions of two other variable.

I acknowledge that the the screenshoot is not the best way to show you the data but this is my starting point:
On stata, I have the variable a and b and I need to create the variable c based on the values of a and b (below the conditions)

For instance if 0<=a<0.1 and 0<=b<10, then c = 0.005

Do you have any advice on how to approach it that is best time-efficient (i.e. without manually including all conditions with if/or commands)?

Array