[R] expressions and paste

[Uwe Ligges]

Emily Baldock wrote:

> I am trying to get a subscript into the title.
> My expression is quote(bold(apoA[bold("1")]))
> I have managed to get something near to what I want with
> 
> sd2 <-1.882
> measure <- "g/L"
> direction <- "increase"
> chem <- quote(bold(apoA[bold("1")]))
> plot(0,0)
>   titletxt <- substitute(paste("per ", sd2, " ",measure," ", direction, "\n in usual ",chem),
>    list(chem = chem,sd2=sd2,measure=measure,direction=direction))
>   title(main=titletxt,cex.main=1.4,font.main=2)


You don't need paste(), and so we get:

sd2 <-1.882
measure <- "g/L"
direction <- "increase"
plot(0,0)
  titletxt <- substitute(bold("per " * sd2 * measure * " " *
    direction * " in usual " * apoA["1"]),
    list(sd2 = as.character(sd2), measure = measure,
         direction = direction))
   title(main=titletxt,cex.main=1.4,font.main=2)

Uwe Ligges




> However, I can't get bold text this way.
> 
> Emily.
> 
> On 11 Nov 2004 at 12:58, Roger D. Peng wrote:
> 
> 
>>Can you be a bit more specific?  Exactly what kind of symbol are you 
>>trying to put in the title?
>>
>>-roger
>>
>>Emily Baldock wrote:
>>
>>>I have written a function to plot data which will be used for various different chemistries.
>>>A simplified version is:
>>>plot_data <- function(risk,levels,chem,sd2,measure){
>>>  plot(risk, levels,main=paste ("per", sd2, measure, "\n in usual", chem))
>>>}
>>>The problem is with the title.
>>>This works fine if the variable "chem" is just text, but if it is an expression then obviously it won't work.
>>>I have experimented with various things and I am at a complete loss for how to insert an expression into the middle of
>>>a title. If the expression was going in directly I would use main=expression(paste("text ", expression, " text")) but
>>>again this doesn't work. Can anyone help? thanks Emily.
>>>
>>>______________________________________________
>>>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
>>>
>>
>>-- 
>>Roger D. Peng
>>http://www.biostat.jhsph.edu/~rpeng/
>>
> 
> 
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