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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