How can i plot the graph of b versus a?

a=-pi:2*pi/30:pi

b=pi/a^2

[Rik]

You should really consider learning the tool before you start using it. One of the many free online Matlab tutorials can be found here.

Answer 1

[Von Duesenberg]

Is this what you had in mind?

a=-pi:2*pi/30:pi;
b=pi./a.^2;
plot(b,a) %or plot(a,b)