[R] passing arguments to simple plotting program.

[Ulrik Stervbo]

HI Gerard,

You get the literals because the variables are not implicitly expanded -
'Placebo(N=n1)  ' is just a string indicating the N = n1.

What you want is to use paste() or paste0():
c(paste0("Placebo(N=", n1, ")"), paste0("Low Dose (N=", n2, ")"),
paste0("High Dose (N=", n3, ")"))
should do it.

I was taught a long ago that attach() should be avoided to avoid name
conflicts. Also, it makes it difficult to figure out which data is actually
being used.

HTH
Ulrik

On Tue, 9 May 2017 at 06:44 Gerard Smits <smits.gerard.j at gmail.com> wrote:

> Hi All,
>
> I thought I’d try to get a function working instead of block copying code
> and editing. My backorund is more SAS, so using a SAS Macro would be easy,
> but not so lucky with R functions.
>
>
> R being used on Mac Sierra 10.12.4:
>
> R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
> Copyright (C) 2016 The R Foundation for Statistical Computing
> Platform: x86_64-apple-darwin13.4.0 (64-bit)
>
>
> resp<-read.csv("//users//gerard//gs//r_work//xyz.csv", header = TRUE)
>
> v5  <-subset(resp, subset=visit==5 & pp==1)
>
> plot_f1 <-function(n1,n2,n3) {
>   attach(v8)
>   par(oma=c(2,2,2,2))
>   boxplot(formula = d_comp ~ rx_grp,
>           main="Figure 2\nChange in Composite Score at Visit 5 (Day
> 31)\nPer Protocol Population",
>           ylim=c(-10,5),
>           names=c('Placebo(N=n1)  ',
>                   'Low Dose(N=n2) ',
>                   'High Dose(N=n3)'),
>           ylab='Change from Baseline')
>   abline(h=c(0), col="lightgray")
> }
>
> plot_f1(n1=114, n2=119, n3=116)
>
> The above is a simplified example where I am trying to pass 3 arguments,
> n1-n3, to be shown in the x-axis tables,  Instead of the numbers, I get the
> literal n1, n2, n3.
>
> Any help appreciated.
>
> Thanks,
>
> Gerard
>
>
>
>
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>
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