[R] suggestions argument in rbga function in genalg package

[Joseph Boyer]

Enrico,

The idea of looking at the code never occurred to me. That's a great idea which will come in useful
I'm sure.

In this particular case the using list() or as.matrix() does not solve the problem, but
those are both good ideas.

Thanks for the reply.

-----Original Message-----
From: Enrico Schumann [mailto:enricoschumann at yahoo.de] 
Sent: Friday, September 23, 2011 12:53 AM
To: Joseph Boyer
Cc: r-help at r-project.org
Subject: Re: [R] suggestions argument in rbga function in genalg package


I do not use this package, but a quick look at the code shows this.

if (!is.null(suggestions)) {
    # [deleted]
    suggestionCount = dim(suggestions)[1]

So 'suggestions' needs to have a dim argument (while the documentation 
speaks of an 'optional list of suggested chromosomes'). You could try

as.matrix(c(1,0.1,10, 100,1,100,1))

But I cannot tell if that solves your problem since you have not 
provided your objective function (ie, you have not provided the 
"commented, minimal, self-contained, reproducible code" that the footer 
of this message speaks about).


Regards,
Enrico

Am 22.09.2011 20:46, schrieb Joseph Boyer:
> Would someone be so kind as to provide example code where they use the suggestions argument in  the rgba function
> In genalg? I can't get it to work.
>
> The following code works just fine:
>
> GenFit<-rbga(Lower, Upper, evalFunc = evaluate)
>
> Lower and Upper are each numeric vectors with 7 elements. Evaluate is an objective function.
> However, when I want to use a suggested chromosome, I get an error message. My code is
>
> start<- c(1,0.1,10, 100,1,100,1)
>
> suggestions<- list(start)
>
> GenFit<-rbga(Lower, Upper, suggestions = suggestions, evalFunc = evaluate)
>
> The error message is:
>
> Error in 1:suggestionCount : argument of length 0
>
> Thanks.
>
>
>
> 	[[alternative HTML version deleted]]
>
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>

-- 
Enrico Schumann
Lucerne, Switzerland
http://nmof.net/