R help - Aug 2011 - Plotting just a portion of a smoother graph in ggplot2

Hi,
I am using ggplot2 to with the following code:

gmathk2 <-
qplot(time,math,colour=Kids,data=kids.ach.lm.k5,geom="smooth",method="lm",formula=y~ns(x,1))
+ opts(title="Smoother Plot: Math K-5") + xlab("Time") +
ylab("Math") +
scale_colour_brewer(pal="Set1"); gmathk2

This plots all the smoother for all the x values. What I'd like to do is
plot the smoother for the x values that are only greater than or equal to 0.
I don't want this:

gmathk2 <-
qplot(time,math,colour=Kids,data=kids.ach.lm.k5,geom="smooth",method="lm",formula=y~ns(x,1))
+ opts(title="Smoother Plot: Math K-5") + xlab("Time") +
ylab("Math")  +
scale_colour_brewer(pal="Set1") + xlim(0,50); gmathk2

Because adding xlim seems to throw away the data below 0 when calculating
the smoother. What I want it to do is have ggplot2 give me the same graph as
the first command but just not plot the part of the smoother that is below
0.

Thanks,
Chris

	[[alternative HTML version deleted]]

It's not immediately obvious

You need to look at coord_cartesian() and its ylim argument. 

Best, t

Sent from my iPhone

On 4 Aug 2011, at 02:38 PM, Christopher Desjardins <cddesjardins at
gmail.com> wrote:
> Hi,
> I am using ggplot2 to with the following code:
> 
> gmathk2 <-
>
qplot(time,math,colour=Kids,data=kids.ach.lm.k5,geom="smooth",method="lm",formula=y~ns(x,1))
> + opts(title="Smoother Plot: Math K-5") + xlab("Time")
+ ylab("Math") +
> scale_colour_brewer(pal="Set1"); gmathk2
> 
> This plots all the smoother for all the x values. What I'd like to do
is
> plot the smoother for the x values that are only greater than or equal to
0.
> I don't want this:
> 
> gmathk2 <-
>
qplot(time,math,colour=Kids,data=kids.ach.lm.k5,geom="smooth",method="lm",formula=y~ns(x,1))
> + opts(title="Smoother Plot: Math K-5") + xlab("Time")
+ ylab("Math")  +
> scale_colour_brewer(pal="Set1") + xlim(0,50); gmathk2
> 
> Because adding xlim seems to throw away the data below 0 when calculating
> the smoother. What I want it to do is have ggplot2 give me the same graph
as
> the first command but just not plot the part of the smoother that is below
> 0.
> 
> Thanks,
> Chris
> 
>    [[alternative HTML version deleted]]
> 
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