[R] xaxp and grid()

[Daniel Mastropietro]

Hello,

I use the option xaxp in the plot function and it is not recognized.
This affects the result of the function grid(), since it takes the default 
tick marks used by the plot function, which is not what I want.

See for example the result of:

plot(1:10,1:10,xaxp=c(1,10,9))
grid(9);			

With grid(9) I want to set a vertical line at each integer value, but this 
divides the interval [2,10] in 9 intervals, just because the first and last 
tick in the x axis are 2 and 10, not 1 and 10 as I request with the xaxp 
option.

Anybody knows how to go around this problem?

I am using R1.5.0 under Windows Me.

Thanks

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