Why do I get undefined variable error in the attached code?
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What's wrong with my code? I can't figure it out, I'm a beginner. Please help.
See screenshots attached. I'm trying to plot and show that the system is non linear.
The error says "undefined Cw1"
3 个评论
KALYAN ACHARJYA
2017-9-9
here Cw1 and Cw2 are not in input data within the function, then how you assigned x(1)=Cw1.. ..so on, So either you have to consider Cw1, Cw2 as input during function call or it should be defined before assigned as x(1)=Cw1.
OCDER
2017-9-9
Did you mean to say this?
Cw1 = x(1);
Cw2 = x(2);
Otherwise, no inputs will affect the output xdot.
dpb
2017-9-9
In future, paste actual code text, not figure. That way folks can edit directly rather than having to type everything from scratch.
回答（1 个）
As another wrote, looks like you transposed the LH and RH sides of the assignment of input argument x to local variables. Why not use the named variable dummy argument array internally as the local variable and Matlab array syntax as well?
function Cwdot=NonLin(t,Cw)
Cwi=1;
k=1.5;
F=100;
V=[400; 2000];
Cw=Cw(:); % ensure column vector
Cwdot=F./V.*(Cwi-Cw)-k*Cw.^2;
end
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2017-9-9
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