[R] doubt about graphics

[Ronaldo Reis Jr.]

Hi,

I have an data like this

x <- c(1:11)
y <- seq(245,445,20)

I make a plot

plot(x,y)

The first y value in y axis is 250 and the last y valeu is 450, the spacing 
between values are 50, so the y values showed are: 250, 300, 350, 400, 450

I need that values in y axis are: 240, 280, 320, 360, 400, 440, 480.

I try

plot(x,y,yaxp=c(240,480,6))

dont work

I try

plot(x,y,yaxp=c(240,480,6),ylim=range(240,480))

dont work too.

How I make this control?

Thanks
Ronaldo

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