Re: Function Returning Answer Variable

[Przemek Klosowski]

On 11/26/2012 04:09 PM, Vesnog wrote:
> Okay I am trying to attach it once more. I thinks now it is attached and I
> have already terminated everything with a semicolon.

It's the function invocation that has to be terminated with a semicolon. 
More importantly, I would recommend not printing the results in the body 
of the function. You already return them as an array: separate 
calculation and printing like so:

[r, tf]=cannon_function(1,2);
printf ("[Range = %f km, Theta_final = %f degrees] \n", r, tf );

The reason why it's useful is that if you rewrite slightly, you can 
apply your function to vector arguments, and get multiple output values 
in one statement. For instance, to plot the range as a function of shot 
elevation you'd do

elevation = 10:5:80;
[range, tf] = vectorized_cannon_function(990,elevation);
plot(elevation,range)

It'll still work with print statements in the function but will look funny.

I didn't look closely at your function but it seems that you do a rough 
integration of the equations of motion with a fixed time step. Octave 
has a ton of numerical integration routines that would do a better job 
of that; check out the ode* functions.