function and matrix form

codes function kdot=train(t,x) alfa=0.3; beta=0.13; gama=0.16; Ua=1; Ub=2; kdot=[k(2);(2/pi)*(atan((x-4)/0.05)+atan((x-2)/0.05))- (alfa+beta*abs(k(2))+gama*(k(2)^2))+Ua-Ub];

end

and the error line

??? Undefined function or method 'k' for input arguments of type 'double'.

Error in ==> train at 7 kdot=[k(2);(2/pi)*(atan((x-4)/0.05)+atan((x-2)/0.05))-(alfa+beta*abs(k(2))+gama*(k(2)^2))+Ua-Ub];

thanks..

[Jan]

Please take the time to format the code properly. Currently it is not readable. Look at the "Markup help" link on this page.

Answer 1

[Walter Roberson]

You have not defined any function or variable named "k", so the k(2) in your function has no meaning.

Answer 2

[Jan]

The error message is clear: You try to access k(2), but k is neither a variable nor a function in the path.

What is k?