Mate came online in 2005, and is still under development. In comparison to professional math applications like Mathematica, it has very limited functionality.
A variable is allocated a value:
a := 3;
b := 2*a;
A function is defined:
f(x) := 2*x^2;
A vector is defined:
t := { 1, 2, 3, 4, 5, 6};
y := f(t);
A graph is plotted:
plot(t,y);