[BioC] problem with read.maimages wt.fun

[gb606342000]

Dear list member,

I am having problem using filtering data using read.maimages and wt.fun (the files are genepix .gpr).

I HAVE THIS FILTER:

filter <- function(x) {
         ifforeground <- (
                 (x[,"% > B635+2SD"] > 70 | x[,"% > B532+2SD"] > 70) &
                 (x[,"F635 Median - B635"] > 4 * x[,"B635 SD"]) &
                 (x[,"F532 Median - B532"] > 4 * x[,"B532 SD"]) &
                 x[,"F635 % Sat."] < 30 & x[,"F532 % Sat."] < 30 &
                 x[,"Dia."] > 60 &
                 (x[,"B635 Mean"] < (1.2 * x[,"B635 Median"]) &
                  x[,"B532 Mean"] < (1.2 * x[,"B532 Median"])) &
                 (x[,"Ratio of Medians (635/532)"] < (1.2 * x[,"Rgn
Ratio
(635/532)"]) |
                 x[,"Ratio of Medians (635/532)"] > (0.8 * x[,"Rgn
Ratio
(635/532)"])) &
                 x[,"Sum of Medians (635/532)"] > 1000
                 )
         ifnotflag <- x$Flags >= 0
         return(as.numeric(ifnotflag & ifforeground))
         }

WHEN I RUN THE SCRIPT BELOW, THERE IS NO PROBLEM:
RG1 = read.maimages(targets, source="genepix",
other.columns=list("% > B635+2SD", "% > B532+2SD","Flags"))

WHEN I ADD wt.fun WITH THE ABOVE filter I GET AN ERROR MESSENGE:

RG1 = read.maimages(targets, source="genepix",
other.columns=list("% > B635+2SD", "% > B532+2SD","Flags"), wt.fun=filter)

Error in gsub("\\.", "\\\\.", x) : 
  input string 1 is invalid in this locale
+ 

Does anyone could help me figure out what is going on?

Thanks.

Giovani


> sessionInfo()
R version 2.9.2 (2009-08-24) 
i386-apple-darwin8.11.1 

locale:
en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] marray_1.22.0 limma_2.18.2