error using feval

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

[Matt Fig]

You should show the code. Describe any variables shown in the code, and any custom functions as well.

[Paulo Silva]

Matt, wish I could vote on your comment :) I was going to ask the same things but something else drawn my attention.

[Adebayo Osuolale]

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]

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]

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.

Answer 1

[Walter Roberson]

Try

which -all feval

You might have an feval that is overriding the system one.

[Adebayo Osuolale]

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)