Hi everyone,
I have already used split() and unsplit() in data frames without problems,
but now Im 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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