

> library(ROCR)
> library(randomForest)
> plot(results,significant)
Error in as.double(x) : 
  cannot coerce type 'S4' to vector of type 'double'
After try with all the possibilities, it shows same error in simpleaffy data 
plot for the results. 

please someone guide me



wiener30 wrote:
> 
> I am trying to use package ROCR to analyze classification accuracy,
> unfortunately there are some problems right at the beginning.
> 
> Question 1) 
> When I try to run demo I am getting the following error message
>> library(ROCR)
>> demo(ROCR)
>> if(dev.cur() <= 1) .... [TRUNCATED] 
> Error in get(getOption("device")) : wrong first argument
> When I issue the command
>> dev.cur() 
> it returns
> null device 
>           1
> It seems something is wrong with my R-environment ?
> Could somebody provide a hint, what is wrong.
> 
> Question 2)
> When I run an example commands from the manual
> library(ROCR)
> data(ROCR.simple)
> pred <- prediction( ROCR.simple$predictions, ROCR.simple$labels )
> perf <- performance( pred, "tpr", "fpr" )
> plot( perf )
> 
> the plot command issues the following error message
> Error in as.double(y) : 
>   cannot coerce type 'S4' to vector of type 'double'
> 
> How this could be fixed ?
> 
> Thanks for the support
> 
> 

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