[R] Scatter plot

[stephen sefick]

#excel like regression line but better
reg.line <- function(y,x, data)
{plot(data[,y]~data[,x], main=paste(x,"vs.",y, sep=" "), xlab=x, ylab=y, pch=20)
line <- lm(data[,y]~data[,x])
d <- summary(line)
mtext(3, line=1, adj=0.25 ,text=bquote(bold(R^2== ~ .(d$r.squared))), bty="n")
abline(line)}

x  <- 1:100+rnorm(100)
y <- 1:100
z <- data.frame(x,y)
reg.line(y="y",x="x",data=z)

try this - as an aside does anyone know how to take the x and y out of
quotes.  What can I do differently

hope this helps

Stephen Sefick


On Wed, Apr 1, 2009 at 9:41 PM, Peter Alspach
<PAlspach at hortresearch.co.nz> wrote:
> Tena koe Sueli
>
> ?abline
> ?text
>
> HTH ...
>
> Peter Alspach
>
>> -----Original Message-----
>> From: r-help-bounces at r-project.org
>> [mailto:r-help-bounces at r-project.org] On Behalf Of Sueli Rodrigues
>> Sent: Thursday, 2 April 2009 2:35 p.m.
>> To: r-help at r-project.org
>> Subject: [R] Scatter plot
>>
>>
>> Hi. How do I plot the straight line and r² in a scatter plot
>> using a simple file x~y?
>>
>> Sueli Rodrigues
>>
>> Eng. Agrônoma - UNESP
>> Mestranda - USP/ESALQ
>> PPG-Solos e Nutrição de Plantas
>> Fones (19)93442981
>>       (19)33719762
>>
>> ______________________________________________
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
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-- 
Stephen Sefick

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