could you tell me the solution?poor me
I think you need to provide more information. From which package is the function minimize()? What kind of object is ZZB?
I don't see the function minimize() in the package SetMethods. I did find a minimize() function in the package QCA and it seems to match the function you are using. That function has an argument named dir.exp. It looks to me like you have mistyped that name as dir,exp. That would account for the error your are seeing. Change your code to use the argument dir.exp.
Thank you very much.oh my gosh,it is juat a comma error.
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