[R] substitution in expression

[Roger D. Peng]

You need substitute(), as in:

x <- "my"
plot(1:10, main = substitute(paste(x, " ", Delta, " values"), list(x = x)))

-roger

Wolski wrote:
> Hi!
> 
> plot(1:10, main=expression(paste( x," ", Delta, " values" )))
> 
> /E
> 
> 
> 
> *********** REPLY SEPARATOR  ***********
> 
> On 9/6/2004 at 3:50 PM Adaikalavan Ramasamy wrote:
> 
> 
>>>>I have been struggling with this problem for a while and I hope
>>>>someone
>>>>could help me. Or if someone could point me to a section in the manual I
>>>>would be grateful.
>>>>
>>>>x <- "my"
>>>>plot(1:10, main=expression(paste( x, Delta, "values" )))
>>>>
>>>>Q : How do I get the title to say "my (triangle symbol) values" ?
>>>>
>>>>
>>>>The following trial-and-error produced mainly errors :
>>>>
>>>>plot(1:10, main=expression(paste( get(x), Delta, "values" ))) 
>>>>plot(1:10, main=expression(paste( substitute(x), Delta, values )))
>>>>plot(1:10, main=expression(paste( deparse(x), Delta, "values" )))
>>>>plot(1:10, main=paste(x, expression(Delta), "values"))
>>>>plot(1:10, main=paste(x, eval(expression(Delta)), "values"))
>>>>plot(1:10, main=paste(x, expression(Delta, "values" )))
>>>>plot(1:10, main=paste(x, expression(paste(Delta, "values" ))))
>>>>
>>>>Many thanks.
>>>>
>>>>Regards, 
>>>>-- 
>>>>Adaikalavan Ramasamy                    ramasamy at cancer.org.uk
>>>>Centre for Statistics in Medicine       http://www.ihs.ox.ac.uk/csm/
>>>>Cancer Research UK                      Tel : 01865 226 677
>>>>Old Road Campus, Headington, Oxford     Fax : 01865 226 962
>>>>
>>>>______________________________________________
>>>>R-help at stat.math.ethz.ch mailing list
>>>>https://stat.ethz.ch/mailman/listinfo/r-help
>>>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
> 
> 
> 
> 
> Dipl. bio-chem. Witold Eryk Wolski             @         MPI-Moleculare Genetic   
> Ihnestrasse 63-73 14195 Berlin                'v'    
> tel: 0049-30-83875219                        /   \       
> mail: witek96 at users.sourceforge.net        ---W-W----    http://www.molgen.mpg.de/~wolski 
>       wolski at molgen.mpg.de
> 
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