Hello.
I have a question that probably has a simple answer.
I have a loop where several figures are plotted with each iteration. I calculate
some descriptives to put in the title of the figure. When I use expression,
since I want to combine math plotting symbols and the descriptives I calculate,
I get an error. Here is an example of the code that I tried:
plot(x,y, main=expression(paste("ID is", ID.i, italic(R)^2, r2.i,
"RMSE", error.i)))
where ID.i, r2.i, and error.i change for each iteration of the loop. I suppose
the problem is that expression does not know to treat each of these as objects
rather than part of a mathematical expression. Is there a way to display the
value of ID.i, r2.i, and error.i within the expression?
Thanks for any thoughts,
Ken
__________________________________________________
[[alternative HTML version deleted]]
You might want to read the "R Help Desk: Automation of Mathematical
Annotation in Plots" in R News 2 (3), 32-34.
and you will understand that the following works:
plot(x, y, main substitute("ID is" * ID.i * ", " *
italic(R)^2 = r2.i * {", RMSE" == error.i},
list(ID.i = ID.i, r2.i = r2.i, error.i = error.i)))
For the next time, please make your example reproducible as the posting
guide asks you to do.
Uwe Ligges
KKThird at Yahoo.Com wrote:> Hello.
>
> I have a question that probably has a simple answer.
>
> I have a loop where several figures are plotted with each iteration. I
calculate some descriptives to put in the title of the figure. When I use
expression, since I want to combine math plotting symbols and the descriptives I
calculate, I get an error. Here is an example of the code that I tried:
>
> plot(x,y, main=expression(paste("ID is", ID.i, italic(R)^2, r2.i,
"RMSE", error.i)))
>
> where ID.i, r2.i, and error.i change for each iteration of the loop. I
suppose the problem is that expression does not know to treat each of these as
objects rather than part of a mathematical expression. Is there a way to display
the value of ID.i, r2.i, and error.i within the expression?
>
> Thanks for any thoughts,
> Ken
>
> __________________________________________________
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> 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
> and provide commented, minimal, self-contained, reproducible code.
Use bquote: ID <- 3 plot(1,1, main = bquote(ID ~ is ~ .(ID))) Also please read the last line of every message to r-help regarding reproducible examples. (None of your variables were defined.) On 12/22/06, KKThird at Yahoo.Com <kkthird at yahoo.com> wrote:> Hello. > > I have a question that probably has a simple answer. > > I have a loop where several figures are plotted with each iteration. I calculate some descriptives to put in the title of the figure. When I use expression, since I want to combine math plotting symbols and the descriptives I calculate, I get an error. Here is an example of the code that I tried: > > plot(x,y, main=expression(paste("ID is", ID.i, italic(R)^2, r2.i, "RMSE", error.i))) > > where ID.i, r2.i, and error.i change for each iteration of the loop. I suppose the problem is that expression does not know to treat each of these as objects rather than part of a mathematical expression. Is there a way to display the value of ID.i, r2.i, and error.i within the expression? > > Thanks for any thoughts, > Ken > > __________________________________________________ > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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 > and provide commented, minimal, self-contained, reproducible code. >