additional graphical parameters in contour function

Do you know why additional graphical parameters (like "type","pch", 
...) do not work in the R contour fonction. For example the command 
'contour(..., type="o",pch=16)' gives nothing, just simple contour 
lines.

Please, can you explain why you think it does make sense here?

The reason is that I want to add on a same graphic several contour plot, 
and I want to give different line types for each contour. I thus thought 
that these options of the contour function made it possible to do it.
But these arguments do not refer to line types at all!

Use "lty" instead as in:

  x <- -6:16
  op <- par(mfrow = c(2, 1))
  contour(outer(x, x), method = "edge", lty=1)
  contour(outer(x, x), method = "edge", lty=2)

Uwe Ligges
Thank.

Uwe Ligges

Thank you for your response.

Abdou. [[alternative HTML version deleted]]

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additional graphical parameters in contour function

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