Plotting the area which is satisfied by some inequalities

How can I plot the area which is satisfied by the constraints:

x1 + x2 >= 1
x1 - x2 <= 0
3*x1 + x2 <= 6
x1, x2 >= 0

Answer 1

[John D'Errico]

I recall a code named plotregion , on the file exchange.

[Ryan Shrott]

That only works if you know the region a priori. In my case, the region is defined in terms of constraints.

[John D'Errico]

What are you talking about? You pass in the constraints to plotregion as a matrix of inequality constraints and sets of lower and upper bounds. That is EXACTLY what you have. I think you need to look at plotregion. Read the help for it.

All I can imagine from your statement here is that you don't know how to write linear inequality constraints in a matrix form. So, are you really asking how one can write those equations in matrix form (i.e., linear algebra 101?)