cant get colAUC to plot

Can someone please explain why this wont plot. The cats example given
for the colAUC function will plot.
Please report bugs in packages to the package maintainer rather than to 
R-help.

Uwe Ligges
Many thanks again
tom

#########################
library(caTools)
a<-rnorm(100)
b<-rbinom(100,1,0.7)
colAUC(a,b,plotROC=TRUE)

colAUC(a,b,plotROC=TRUE)
Error in strwidth(legend, units = "user", cex = cex) :
        argument "legend" is missing, with no default

R.Version()
$platform
[1] "x86_64-pc-linux-gnu"

$arch
[1] "x86_64"

$os
[1] "linux-gnu"

$system
[1] "x86_64, linux-gnu"

$status
[1] ""

$major
[1] "2"

$minor
[1] "1.0"

$year
[1] "2005"

$month
[1] "04"

$day
[1] "18"

$language
[1] "R"

______________________________________________
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Sorry perhaps I should have posted again. It wasnt a package error
instead it was my misunderstanding of what the package was asking for.
For future information the colAUC function requires a dataframe with at
least two datasets as well as an outcome set. It can be 'tricked' into
drawing an ROC curve for one set simply by duplicating the data.
tom wright wrote:

Can someone please explain why this wont plot. The cats example given
for the colAUC function will plot.
Please report bugs in packages to the package maintainer rather than to 
R-help.

Uwe Ligges

Many thanks again
tom

#########################
library(caTools)
a<-rnorm(100)
b<-rbinom(100,1,0.7)
colAUC(a,b,plotROC=TRUE)

colAUC(a,b,plotROC=TRUE)
Error in strwidth(legend, units = "user", cex = cex) :
        argument "legend" is missing, with no default

R.Version()
$platform
[1] "x86_64-pc-linux-gnu"

$arch
[1] "x86_64"

$os
[1] "linux-gnu"

$system
[1] "x86_64, linux-gnu"

$status
[1] ""

$major
[1] "2"

$minor
[1] "1.0"

$year
[1] "2005"

$month
[1] "04"

$day
[1] "18"

$language
[1] "R"

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html