Date: Dec 6, 2012 11:54 AM
Author: Alex
Subject: Re: I'm new to matlab; why is this function wrong?
"Sargondjani" wrote in message <k9qhho$obr$1@newscl01ah.mathworks.com>...

> you can only define functions inside a function-file and not in a script (dont ask me why, because it bothered me too, but matlab developers usually have good reasons for doing such things)

>

> so either:

> 1) transform your script into a function:

> start with: "function my_script()" and end with "end"

>

> 2) define the function in an m-file that you call in your script

>

> i hope this helps...

Thanks Sargondjani.

Now when I run this script:

plot(0,0,'yX')

hold on

for n = 1:1:730

del_t=24*3600;

[R V] = orbits(Ro, Vo, del_t);

plot(R(1),R(2),'go')

hold on;

Ro=R;

Vo=V;

end

calling function:

function [R V] = orbits(Ro, Vo, del_t)

Ro=[1.5e11, 0];

Vo=[0, 2*pi*Ro(1)/(365*24*60*60)];

G = 1.67e-11;

del_t=24*3600;

Ms = 1.97e30;

d = (Ro(1)^2 + Ro(2)^2)^(3/2);

a = -(G*Ms/d)* Ro;

V = Vo + a * del_t;

R = Ro + Vo * del_t + .5 * a * del_t^2;

end

I get Error in ==> two_dimensional_ac at 5

[R V] = orbits(Ro, Vo, del_t);