Hi,

I have two tables and I need to merge both. I use the merge command, but 
in this way the name must be exactly. How I can make to compare 
independently of upper or lower-case?

Look:

data1<-data.frame(journal=c("Ecology","Environmental 
Entomology","Neotropical Biology And Conservation"))

data2<-data.frame(journal=c("Ecology","Environmental 
Entomology","Neotropical Biology and 
Conservation","Sociobiology"),qualis=c("A1","A2","B1","B5"))

merge(data1,data2)

 > merge(data1,data2)
                    journal qualis
1                  Ecology     A1
2 Environmental Entomology     A2

the expected result is:

                                journal      qualis
1                              Ecology          A1
2             Environmental Entomology          A2
3 Neotropical Biology And Conservation          B1

Look that result is wrong because the "And" and "and" in the name 
"Neotropical Biology And Conservation"

how to fix it automatically? Has any function to make all names 
lowercase or any other mean to make this to work.

Thanks
Ronaldo

-- 
16ª lei - Lembre-se, é a sua dissertação. Você (!) é quem precisa fazê-la.

       --Herman, I. P. 2007. Following the law. NATURE, Vol 445, p. 228.

>  Prof. Ronaldo Reis Júnior
|  .''`. UNIMONTES/DBG/Lab. Ecologia Comportamental e Computacional
| : :'  : Campus Universitário Prof. Darcy Ribeiro, Vila Mauricéia
| `. `'` CP: 126, CEP: 39401-089, Montes Claros - MG - Brasil
|   `- Fone: (38) 3229-8192 | ronaldo.reis@unimontes.br
| http://www.ppgcb.unimontes.br/lecc | LinuxUser#: 205366


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