How to force an point in x-axis to appear in plot

Dear all,

With this snippet:
xlim=c(-126000,500000)

in the current plot, the x-axis appear  in the following tick marks:

-100000, 100000, 300000, ...etc

How can we force a point where x=0 to appear in the plot?
Yielding:

-100000, 0, 100000, 300000, ...etc
               ^

in the x-axis tick marks.

axis(side=1,at=0) might give what you want.

But I get a 0 tick mark plotted automatically when I try a simple  
example.
This could be due to OS difference I guess.

	cheers,

		Rolf Turner

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