0 个投票

Hello, Please I keep getting "error using feval. Undefined variable or function( name of my system)" when I never introduce a new system in to matcont. I have everything I could do but it persists. Please i will like your contributions.
Thanks

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Matt Fig
Matt Fig 2011-6-9
You should show the code. Describe any variables shown in the code, and any custom functions as well.
Paulo Silva
Paulo Silva 2011-6-9
Matt, wish I could vote on your comment :) I was going to ask the same things but something else drawn my attention.
Adebayo Osuolale
Adebayo Osuolale 2011-6-9
the system is
x'=(lamda-b)*-cee*y+x*z+d*x*(1-z^2)
y'=cee*x+(lamda-b)*y+y*z+d*y*(1-z^2)
z'=lamda*z-(x^2+y^2+z^2)
Actually,whenever I first introduce a system to matcont I get the error message but some after several trials the system may run. I dont know the cause of the problem. Perhaps if I know the cause I will be able to avoid. Please, I seriously need help because I am supposed to matcont for my MSc project and I have few days to my presentation. Thank you and God bless you.
Walter Roberson
Walter Roberson 2011-6-9
Sorry, matcont is a third-party package that I have not encountered before. There does not appear to be any defined support resource for it.
Ann Tate
Ann Tate 2015-6-20
I got this error as well. It ended up being that I had only added the matcont main folder to the path, and not the subfolders. Adding the subfolders fixed the issue.

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Walter Roberson
Walter Roberson 2011-6-9

1 个投票

Try
which -all feval
You might have an feval that is overriding the system one.

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Adebayo Osuolale
Adebayo Osuolale 2011-6-9
Thanks Mr Walter Roberson. I tried it but it didnt work. I will be very grateful if you can tell me the possible cause of this error.
This is the system
x'=(lamda-b)*-cee*y+x*z+d*x*(1-z^2)
y'=cee*x+(lamda-b)*y+y*z+d*y*(1-z^2)
z'=lamda*z-(x^2+y^2+z^2)

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