[R] Fold function with several time varying covariates

[Jenkins, Helen]

The error message when I use list is:
" s.matrix(!is.na(new.data[, cov.names])) : 
  invalid subscript type 'list'"

**PLEASE NOTE MY EMAIL ADDRESS HAS CHANGED TO h.jenkins05 at imperial.ac.uk**
Helen Jenkins
Dept of Infectious Disease Epidemiology
Imperial College, London
St Mary's Campus
Norfolk Place
London W2 1PG

Tel: +44 (0)20 7594 3265
Email: h.jenkins05 at imperial.ac.uk 
Website: http://www1.imperial.ac.uk/medicine/people/h.jenkins/ 


-----Original Message-----
From: Allan Engelhardt [mailto:allane at cybaea.com] 
Sent: 29 June 2009 14:20
To: Jenkins, Helen
Cc: 'r-help at r-project.org'
Subject: Re: [R] Fold function with several time varying covariates


On 28/06/09 18:02, Jenkins, Helen wrote:
> But this just gives me an error message.
>    
What error message?