[R] ggplot2 plot with symbols and then add line

[stephen sefick]

Thanks hadley I tried just shape=NULL, but did not wrap it in the aes
argument which makes sense.
thanks

On Tue, Oct 14, 2008 at 8:11 AM, hadley wickham <h.wickham at gmail.com> wrote:
> On Tue, Oct 14, 2008 at 6:46 AM, stephen sefick <ssefick at gmail.com> wrote:
>> r <-(structure(list(TSS = c(2.8, 8.4, 11, 1.3, 4.2, 2, 3.4, 14, 8.2,
>> 3.1, 1.4, 0.9, 0.5, 6.1, 9.2, 0.6, 1, 11, 2.4, 1.2, 1.3, 1.3,
>> 0, 1.8, 8, 11, 11, 8.5, 8.5, 1.8, 13, 4.4, 1.4, 2.1, 0.5, 25,
>> 25, 9.3, 6.1, 1.6, 1.5, 19, 19, 24, 9.6, 1.8, 1.4, 1), GPP = c(1.213695235,
>> 3.817313822, 1.267930498, 10.45692825, 3.268295623, 3.505286001,
>> 4.468225245, 0.915653726, 1.635617261, 3.726133898, 1.363453706,
>> 13.99650967, 1.581182762, 0.417618143, 0.741080504, 1.366790205,
>> 0.969326797, 0.412440872, 1.780215366, 3.515743675, 8.248491445,
>> 0.125726306, 13.95880794, 4.850627229, -0.438311644, 1.537773727,
>> 1.537773727, 3.249103284, 3.249103284, 2.470317011, 0.768531626,
>> 2.633107621, 3.113199095, 0.773824094, 3.208461305, 0.680150068,
>> 0.680150068, 0.026385752, 0.369310858, 8.049276658, 7.487378383,
>> 0.950072035, 0.950072035, 0.763580377, 0.333244629, 5.475999014,
>> 9.235631398, 2.587682905), RiverMile = c(148L, 179L, 185L, 202L,
>> 179L, 185L, 190L, 119L, 148L, 179L, 185L, 202L, 215L, 119L, 202L,
>> 198L, 215L, 148L, 198L, 190L, 202L, 215L, 198L, 198L, 215L, 148L,
>> 148L, 202L, 202L, 215L, 119L, 179L, 185L, 190L, 198L, 61L, 61L,
>> 119L, 148L, 202L, 202L, 61L, 61L, 119L, 148L, 185L, 202L, 215L
>> )), .Names = c("TSS", "GPP", "RiverMile"), class = "data.frame",
>> row.names = c(12L,
>> 13L, 14L, 19L, 25L, 26L, 28L, 34L, 35L, 36L, 37L, 42L, 44L, 58L,
>> 75L, 85L, 88L, 91L, 97L, 107L, 142L, 144L, 155L, 166L, 169L,
>> 185L, 186L, 201L, 202L, 207L, 219L, 221L, 222L, 224L, 226L, 230L,
>> 231L, 250L, 251L, 258L, 283L, 287L, 288L, 303L, 304L, 306L, 311L,
>> 313L)))
>>
>> library(lattice)
>> library(ggplot2)
>> z <- nls(GPP~(a/(TSS+b)), start=c(a=0.01, b=0.01), data=r)
>> f <- seq(-1, 29, length=100)
>> y <- coef(z)["a"]/(f+coef(z)["b"])
>> pred <- data.frame(GPP = f, TSS = y)
>>
>> #this is what I can do
>> qplot(TSS, GPP, data=r, colour=as.factor(RiverMile)) +
>> geom_line(data=pred, colour ="black")
>>
>> #I would like to do this and then add the nls line
>> qplot(TSS, GPP, data=r,
>> shape=as.factor(RiverMile))+scale_shape_manual(values=1:9)
>>
>> #how do you undo the mapping of shape to add a line is my question
>> #thanks
>
> + geom_line(aes(shape = NULL))
>
> Alternatively you can use the full ggplot specification, and only
> supply shape to the points:
>
> ggplot(r, aes(TSS, GPP)) +
>  geom_point(aes(shape = factor(RiverMile)) +
>  geom_line(data = pred) +
>  scale_shape_manual(values = 1:9)
>
> Hadley
>
> --
> http://had.co.nz/
>



-- 
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis