From: Luis A Escobar <luis_at_lsu.edu>

Date: Wed 17 Jan 2007 - 16:08:24 GMT

xmax<-max(abs(x))

dimensions<-matrix(c(xmax/24,xmax/24),nrow=1) symbols(0.5,0.5,rectangle=dimensions,bg='white',fg='white',add=TRUE,inch es=FALSE)

text(0.5,0.5,expression(theta),cex=3)

R-help@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. Received on Thu Jan 18 03:14:23 2007

Date: Wed 17 Jan 2007 - 16:08:24 GMT

I do not know the precise language to describe the situation. But here
it is what I want to do.

x<-c(0,1) plot(x,x,type='l') text(0.5,0.5,expression(theta),cex=3)

The line is visible inside the theta symbol. I would like to avoid that.

Following the solution to problem 3.2 in the ISwR book, for a related
problem, I used the symbols package to write a rectangle (it can a
circle, etc)

with white bf and white fg and then write the label on top of that
rectangle.

Here is it is the code

x<-c(0,1) plot(x,x,type='l') text(0.5,0.5,expression(theta),cex=3)

xmax<-max(abs(x))

dimensions<-matrix(c(xmax/24,xmax/24),nrow=1) symbols(0.5,0.5,rectangle=dimensions,bg='white',fg='white',add=TRUE,inch es=FALSE)

text(0.5,0.5,expression(theta),cex=3)

It seems to work, but I am not happy with this solution. The symbols statement above has fixed dimensions and does not work well with multiple labels of different sizes. With multiple curves the symbols statement might peel off other curves, axis, etc. Also if one changes the size of the label (using cex), the size of the "rectangle" might be too big or too small and it has to be adjusted.

What I would like to have is a simple way to write the label over the
line such

that the label only wipes out what is needed to avoid seeing the curve
behind. It is like I need a rectangles with rubbery dimensions to
contain just the label I am writing.

I searched the FAQ questions for related problems but I did not find something related.

My R skills are very rudimentary and I would not surprised the solution is trivial.

Thank you for any help.

Luis Escobar

R-help@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. Received on Thu Jan 18 03:14:23 2007

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