Dear Rosa, you can use grep for pattern matching along the lines of:
x <- c("000711111101", "000711111111", "000711111112","123456789123") grep("^[0-9]{2}07[0-9]{6}(01|11)", x) Here I assume that your real IDs consist of integers only. The pattern matches two integers followed by 07 followed by 6 integers and finally 01 or 11 Hope this helps, Ulrik On Mon, 5 Sep 2016 at 13:54 Rosa Oliveira <rosit...@gmail.com> wrote: > Dear all, > > I have searched all over and didn´t found an answer :( Sorry, I'm new. > > I need urgently to "not analyse"the weight the ID's that have 07 in the > position 3 and 4 respectively, 01 or 11 in positions 11 and 12 of ID > variable. . > > I used the following code: > > base<--baseR[substr(baseR$'ID',3,4)!='03' > &substr(baseR$'ID',11,12)!='01' > &substr(baseR$'ID',11,12)!='11',] > > But, instead of removing just the id's that respect the 3 conditions > simultaneously, base don't have all the id's that have 03 in the 3 and 4 > positions os id variable, neither 01 in positions 11 and 12 of ID, > neither 11 > in positions 11 and 12 of ID variable.variable. > > So, it seems, that the code exclude all the conditions, as it was a OR (|) > condition in spite of AND (&) condition. > > Can anyone help me please? > > I attach the data. > > Best, > Rosa Oliveira > > __________________________________ > > Antes de imprimir este e-mail pense bem se tem mesmo que o fazer. > Há cada vez menos árvores. > Não imprima, pense na sua responsabilidade e compromisso com o MEIO > AMBIENTE! > < > http://pt.dreamstime.com/cora-ccedil-atildeo-criado-das-folhas-de-aacutervores-diferentes-thumb12275776.jpg > > > < > http://pt.dreamstime.com/cora-ccedil-atildeo-criado-das-folhas-de-aacutervores-diferentes-thumb12275776.jpg > > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.