Round a line

R-help,

I have lloked in the archives found no answer to how to round the line
joint.

I have usedthe arguments lnd, ljoin in par but I get no differences in
the plotting.

x=1:10
par(ljoin="round",lend="round")
plot(x,sin(x),type="l",lwd=2)


Any suggestions?

I run on a Windows XP machine.

version

_              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    2              
minor    1.0            
year     2005           
month    04             
day      18             
language R  

Thank you in advance