On 26 April 2011 12:08, Ivan Calandra <ivan.calandra@uni-hamburg.de> wrote:

> Dear users,
>
> I'm trying to get a dot plot but always end up with a boxplot. Can someone
> please tell me what I am doing wrong?
>
> df <- structure(list(FACETTE = structure(c(1L, 1L, 1L, 1L, 2L, 2L,
> + 2L, 2L), .Label = c("base", "tip"), class = "factor"), Sq = c(274836,
> + 0.74182, 0.709205, 0.984552, 279869, 255712, 26566, 301464)), .Names =
> c("FACETTE",
> + "Sq"), class = "data.frame", row.names = c(1L, 2L, 3L, 4L, 6L,
> + 7L, 8L, 9L))
>
> with(df, plot(Sq~FACETTE, type="p"))
> with(df, plot(Sq~FACETTE, type="n"))
>
> I get boxplots in both cases. What should I do to get points instead of
> boxes?
>
> Don't use a factor?

with(df, plot(Sq~as.numeric(FACETTE), type="p"))

works, but you then need to play a bit with the x axis to get the labels
etc. right:

with(df, plot(Sq~as.numeric(FACETTE), type="p", xaxt="n"))
 axis(1, c("base", "tip"), at=c(1,2))

Bob

-- 
Bob O'Hara

Biodiversity and Climate Research Centre
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