Re-reading your question and taking a wild guess, perhaps you are looking for parse() and eval() ...
xyz <- data.frame( a=c(1,2), b=c(3,4)) xyz a b 1 1 3 2 2 4 expp <- parse(text="xyz$a > 1 & xyz$b == 4") # turn a string into an expression expp expression(xyz$a > 1 & xyz$b == 4) xyz[eval(expp), ] # evaluate an expression in place a b 2 2 4 ... but really, it's just a guess at what you might be trying to do. B. On Apr 18, 2015, at 1:30 PM, Boris Steipe <boris.ste...@utoronto.ca> wrote: > Sorry - it's not entirely clear to me what you need to do. > > See here for some hints on how to ask questions on this list. I'm sure we'll > be able to help quickly. > http://adv-r.had.co.nz/Reproducibility.html > http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example > (and don't post in HTML :-) > > > B. > > On Apr 18, 2015, at 11:10 AM, Fernando Gama <f.fabiogam...@gmail.com> wrote: > >> Hello Boris, >> >> thanks for your response. >> >> So, firstly considered that i've been input a set of serches strings (.txt >> format) and i'm using regex to transform in a suitable format to my script. >> This part is a final part of my code and i wish putting in input to a subset. >> >> (.txt formatted) >> >> ---- STRINGS (INPUT) >> >> [1] "municipio =='Limeira' " >> [2] "municipio =='Limeira' & mesincident =='marco' " >> [3] "municipio =='Limeira' & mesincident =='marco' & trechoklmetros > 1.00 >> 12.300" >> ... >> .. >> .. >> .. >> [n] "......" >> >> -------------- >> >> desired_fomart <- it will reveice all strings to filter in a dataset by >> subset below: >> >> >> a loop each line: >> >> subset(dataset_read, desired_fomart[i]) >> >> My question: taking into consideration this cenario, in your oppinion your >> reply is my suitable for my problem, whereas i will to map each value in >> database? >> >> Once again, thank so much! :) >> >> 2015-04-18 11:04 GMT-03:00 Boris Steipe <boris.ste...@utoronto.ca>: >> This is not a regular expression but simply a conjunction (sequence of '&') >> of logical expressions. Moreover it's not wrong. Consider: >> >> xyz <- data.frame(municipio = c('Limeira'), mesincident = c('marco'), >> trechoklmetros = c(3.00, -4.00, 30)) >> xyz >> >> municipio mesincident trechoklmetros >> 1 Limeira marco 3 >> 2 Limeira marco -4 >> 3 Limeira marco 30 >> >> >> xyz$municipio =='Limeira' & xyz$mesincident =='marco' & xyz$trechoklmetros > >> 1.00 >> [1] TRUE FALSE TRUE >> >> xyz$municipio =='Limeira' & xyz$mesincident =='marco' & xyz$trechoklmetros > >> 1.00 & xyz$trechoklmetros <= 12.3 >> [1] TRUE FALSE FALSE >> >> >> If there's a problem it seems to be elsewhere. >> Cheers, >> Boris >> >> >> On Apr 17, 2015, at 4:22 PM, Fernando Gama <f.fabiogam...@gmail.com> wrote: >> >>> Hello, >>> >>> I have benn problems to construct the pattern for this: >>> >>> municipio =='Limeira' & mesincident =='marco' & trechoklmetros > 1.00 12.300 >>> >>> I would like: >>> >>> municipio =='Limeira' & mesincident =='marco' & trechoklmetros > 1.00 >>> *& **trechoklmetros >>> <= *12.300 >>> >>> Any suggestion? >>> >>> >>> -- >>> Att, >>> >>> Fernando Gama da Mata >>> >>> [[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. >> >> >> >> >> -- >> Att, >> >> Fernando Gama da Mata >> >> > > ______________________________________________ > 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. ______________________________________________ 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.
