Hi All, It seem that I can never get the returned values of 'paste0' been evaluated , as well as any characters that have been quoted. Do I have to use 'substr' or 'gsub' to remove these quotation marks ? Bests, Allen Chiu > eval(paste0('1','+','1')) [1] "1+1" > eval(expression(paste0('1','+','1'))) [1] "1+1" > eval(expression("1+1")) [1] "1+1" > eval("1+1") [1] "1+1" > eval(expression(1+1)) [1] 2 > eval(1+1) [1] 2 2014-08-20 [[alternative HTML version deleted]]

The result of paste0 is a character vector, so it's already evaluated and eval() will act like identity(). If you want to convert your character vector to a language object, use parse(text=v), so: > eval(parse(text=paste0('1','+','1'))) [1] 2 On Wed, Aug 20, 2014 at 5:40 AM, my1stbox <my1stbox at="" 163.com=""> wrote: > Hi All, > It seem that I can never get the returned values of 'paste0' been > evaluated , as well as any characters that have been quoted. Do I have to > use 'substr' or 'gsub' to remove these quotation marks ? > Bests, > Allen Chiu > > > eval(paste0('1','+','1')) > [1] "1+1" > > eval(expression(paste0('1','+','1'))) > [1] "1+1" > > eval(expression("1+1")) > [1] "1+1" > > eval("1+1") > [1] "1+1" > > eval(expression(1+1)) > [1] 2 > > eval(1+1) > [1] 2 > > > > > > > 2014-08-20 > [[alternative HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor at r-project.org > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: > http://news.gmane.org/gmane.science.biology.informatics.conductor > [[alternative HTML version deleted]]