[R] par() function problem

[zlamal@ufi.fme.vutbr.cz]

Hi,
  I want to change line and marker type using par() function (my 
example is taken from bigger function)
 
oldpar<-par(no.readonly=TRUE)
par(type="b",lty=1)
  plot(x1,col=1)
par(type="b",lty=2)
  lines(x2,col=2)
par(oldpar)  # restore plotting parameters

First line is drawn only with circles (no line)
Second line is drawn only line but not circles.

Where is problem?

Jakub Zlamal
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