How can I plot a function?

Hello everybody,

I am new in Matlab (student) and i m trying to plot this:

x=1:5:800;

y=@(x)4*3.14*28*10^9*x/(3*10^8);

plot (x,y)

But when i run it shows me this:

Error using plot

Invalid data argument.

Error in freespace (line 3)

plot (x,y)

What am i doing wrong?

Sorry for my english

Answer 1

[DGM]

Try this:

x=1:5:800;
y=@(x) 4*pi*28*10^9 * x/(3*10^8); %i'm assuming you want pi there
plot(x,y(x)) % use it as a function

[Ioannis Filippidis]

Thanks.That helps