[R] I can't with expression

Hi all, I need an R expression, expression() to get the follows Latex code: $P^\uparrow_{SF}$. Imposible, for me!!. Thank you in advance /salva __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the

[R] problems with 'eval' and 'parse' with strings

Hi R-friends: I don't understand very well the parser. if I do: p=v= q=5 eval(parse(text=paste(p,q,sep=))) ... then the value of v is 5, OK. but I can't with strings, for example: p=v= q=hello friend eval(parse(text=paste(p,q,sep=))) .. error and, I would need that v has the value