[R] problem with optim: (list) object cannot be coerced to 'double'

[Zebouni, Stephane (Exchange)]

Hi,

 

I am trying to use optim to solve a heavy calibration problem. I supply
the parameters in vector form. But before entering my target 

 

The call is simply:

 

optim(par = parameters, fn = SumLSQ, method = "Nelder-Mead")

 

the function SumLSQ is simply:

 

SumLSQ<-function(parameters, data = timeseries){

 

print("sumLSQ")

      

 

      nbseries = dim(timeseries)[2]/3

 

      SumLSQ = 0

      

      for (i in (1:nbseries)){

            SumLSQ = SumLSQ +
LSQ(parameters,timeseries[,((i-1)*3+1):(i*3)])

      }

 

}

 

I actually never enter the objective function SumLSQ. I always receive
the error:

 

(list) object cannot be coerced to 'double'

 

And I really don't know where it comes from. II thought it was the
format of "par" argument but I think it is correct to supply a numerical
vector  ...

 

Thnaks a lot for any help!

 

Stephane

 

 

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