[R] Using package ROCR

[Uwe Ligges]

For question 1: Can you please report to the package maintainer (well, I 
am CCing Tobias now) who will certainly be happy to improve the package 
(particularly the demo behaviour).

For question 2 (and your latest message):
does not happen for me. Which versions are you using, i.e. have you 
updated to the most recent ones? In any case, using Namespaces is 
another thing that might be worth considering for Tobias as the ROCR 
maintainer.

Tobias, a last point for you: Your package gives WARNINGs in the checks 
for ages now, can you please fix that also.

Thank you,
Uwe Ligges



wiener30 wrote:
> Just an update concerning an error message in using ROCR package.
> 
> Error in as.double(y) : 
>   cannot coerce type 'S4' to vector of type 'double' 
> 
> I have changed the sequence of loading the packages and the problem has
> gone:
> library(ROCR)
> library(randomForest)
> 
> The loading sequence that caused an error was:
> library(randomForest)
> library(ROCR)
> 
> May be this info could be useful for somebody else who is getting the same
> error.
> 
> 
> 
> 
> wiener30 wrote:
>> Thank you very much for the response!
>>
>> The plot(1,1) helped to resolve the first problem.
>> But I am still getting a second error message when running demo(ROCR)
>>
>> Error in as.double(y) : 
>>   cannot coerce type 'S4' to vector of type 'double'
>>
>> It seems it has something to do with compatibility of S4 objects.
>>
>> My versions of R and ROCR package are the same as you listed.
>> But it seems something other is missing in my installation.
>>
>>
>> William Doane wrote:
>>>
>>> Responding to question 1... it seems the demo assumes you already have a
>>> plot window open.
>>>
>>>   library(ROCR)
>>>   plot(1,1)
>>>   demo(ROCR)
>>>
>>> seems to work.
>>>
>>> For question 2, my environment produces the expected results... plot
>>> doesn't generate an error:
>>>   * R 2.8.1 GUI 1.27 Tiger build 32-bit (5301)
>>>   * OS X 10.5.6
>>>   * ROCR 1.0-2
>>>
>>> -Wil
>>>
>>>
>>>
>>> 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
>>>>
>>>>
>>>
>>
>