[R] glmpath error

[Prof Brian Ripley]

On Wed, 19 Sep 2007, Duncan Murdoch wrote:

> On 9/19/2007 7:46 AM, Tirthadeep wrote:
>> Then what is the solution?
>
> The same method you used for the other columns:
>
> train.data[,21]

However, the error message is about the first argument (x) and not NULL 
for the second argument (and applying $ to a matrix will give a warning in 
recent versions of R).

I think it most likely that train.data is a data frame, in which case the 
problem lies in the first argument.  glmpath makes no attempt to coerce 
its arguments to the desired form, so you do need to supply exactly what 
the help page says.  (Although it does not say x should be numeric, it 
does need to be.)

>
> Duncan Murdoch
>
>>
>>
>>
>>
>> Duncan Murdoch-2 wrote:
>>>
>>> Tirthadeep wrote:
>>>> Hi,
>>>>
>>>> I am using glampath package for L1 regularized logistic regression. I got
>>>> the following error messege.
>>>>
>>>>
>>>>> model.fit <- glmpath(train.data[,1:20], train.data$RES, family=binomial)
>>>>>
>>>> Error in one %*% x : requires numeric matrix/vector arguments
>>>>
>>>> where train.data is a 700X21 matrix and 21st column in response (RES).
>>>>
>>> If it is a matrix, then train.data$RES won't work.  That column
>>> selection method only works for data frames,
>>> because they are lists, and matrices aren't.
>>>
>>> Duncan Murdoch
>>>> Please clarify!!!
>>>>
>>>> Thanks
>>>>
>>>
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>>>
>>
>
> ______________________________________________
> 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.
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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