# [R] substitution in expression

Mon Sep 6 18:36:45 CEST 2004

```Thank you all especially to Wolski, Roger Peng, Thomas Petzoldt and Uwe
Ligges !

Substitute with listing the environment was exactly what I needed.

On Mon, 2004-09-06 at 16:27, Roger D. Peng wrote:
> 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
> >>>>
> >>>>______________________________________________
> >>>>R-help at stat.math.ethz.ch mailing list
> >>>>https://stat.ethz.ch/mailman/listinfo/r-help
> >
> >
> >
> >
> > 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
> >
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help