writePosition does not work inside of a function

So i'm trying to make a function that i can input a number from 0 to 1 and the function turns the servo how i specify. Problem is, the servo just never turns. I don't get an error, it acknowledges the arduino and servo connections, but it just refuses to turn the servo. When i do this in a script, it works just fine. I need help, please.

function servocontrol(theta)
a=arduino();
s=servo(a,'D9');
writePosition(s,theta)
end

[Walter Roberson]

I do not recommend creating a connection to arduino each time. I recommend creating it once and storing the connection (a) somewhere that can be accessed. http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

[Yousef Gaffary]

Thank you for the reply my follow up question is, even if i do create the connection every time, how come the servo still won't rotate? Even if i store the connection, i feel like the result will be the same. Is there a reason why writePosition does not work in a function?

[Walter Roberson]

I am not aware of any reason why writePosition would not work in a function. I am, however, concerned about the possibility that there might already be a connection open to the arduino and so the arduino() call inside the function might not be able to communicate properly.