[R] Problems with unsplit()

From: Cecilia Carmo <cecilia.carmo_at_ua.pt>
Date: Thu, 19 May 2011 11:27:39 +0100

Hi everyone,  

I have already used split() and unsplit() in data frames without problems, but now I’m applying these functions to other data and when using unsplit() I have received the following message:  

Error in `row.names<-.data.frame`(`*tmp*`, value = c("1", "2", "3", "4", :

  duplicate 'row.names' are not allowed

In addition: Warning message:

non-unique values when setting 'row.names': ‘’  

Could anyone explain me what does this mean?  

Thank you in advance,  

Cecília Carmo

(Universidade de Aveiro - Portugal)

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