R help - Sep 2011 - suggestions argument in rbga function in genalg package

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]]

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]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
-- 
Enrico Schumann
Lucerne, Switzerland
http://nmof.net/

On Thu, Sep 22, 2011 at 06:46:23PM +0000, Joseph Boyer
wrote:
> 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.
rbga( c( -1, -1), c( 1, 1), evalFunc= function( string){ sum(
string**2)**0.5}, suggestions=t( as.data.frame( c( 0, 0))))

Regards