[R] lattice plot: points and lines for different variables in same plotlattice plot

[Duncan Mackay]

Hi Naresh

Try

xyplot(y + y.fit ~ x | name, data = my.df,
         type = c("p","l"),
         distribute.type = TRUE,
         panel = panel.superpose
)

Your code seems to be a direct copy from the command line; sometimes it
makes it clearer to arguments and functions within the panel function on
their own line

Regards
Duncan

Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Naresh
Gurbuxani
Sent: Monday, 5 October 2015 05:30
To: r-help at r-project.org
Subject: [R] lattice plot: points and lines for different variables in same
plotlattice plot

I want to draw scatter plot and a fitted line in the same lattice plot.  My
problem is that either both can be plotted as points or both as lines.  The
code that attempts to plot points for data and lines for fitted line does
not work.  

Thanks,
Naresh

library(lattice)
library(plyr)

my.df <- data.frame(x = rnorm(100), y = rnorm(100), name = "A")

temp.df <- data.frame(x = rnorm(100), name = "B")
temp.df <- within(temp.df, {y <- x + 0.2 * rnorm(100)})
my.df <- rbind(my.df, temp.df)

temp.df <- data.frame(x = rnorm(100), name = "C")
temp.df <- within(temp.df, {y <- x + 0.5 * x^2 + 0.2 * rnorm(100)})
my.df <- rbind(my.df, temp.df)

my.df <- ddply(my.df, c("name"), mutate, y.fit = lm(y ~ x +
I(x^2))$fitted.values)

my.df <- my.df[order(my.df$name, my.df$x),]

# This works
xyplot(y + y.fit ~ x | name, data = my.df, type = c("l"))

# This does not work.  Line plot seems wrong.
xyplot(y + y.fit ~ x | name, data = my.df, type = c("l"), y.prime =
my.df$y.fit, panel = function(x, y, y.prime, ...){panel.xyplot(x, y);
panel.lines(x, y.prime, type = "l")})


 		 	   		  
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