Hi Romzero,
This gets the job done, though it is not the most elegant solution
ever (for those I'd take a look at the ggplot2 or lattice packages).
## Read in data
la - read.table(textConnection(
DaysWeight
0 178.00
0 250.00
0 242.00
0 239.00
0 223.00
0 188.00
0 237.00
0 212.00
0 273.00
0 191.00
0 173.00
0 233.00
0 227.00
0 253.00
0 232.00
4 177.00
4 249.00
4 241.00
4 238.00
4 222.00
4 188.00
4 236.00
4 211.00
4 272.00
4 190.00
4 172.00
4 232.00
4 226.00
4 252.00
4 231.00), header = TRUE)
closeAllConnections()
## calculate mean by day
tmp - c(with(la, by(Weight, Days, mean)))
## your plot
plot(Weight ~ Days, data = la)
## add in the daily means
points(x = as.numeric(names(tmp)), y = tmp, col = blue, cex = 2, pch = 16)
Cheers,
Josh
On Sun, Nov 7, 2010 at 10:53 AM, romzero romz...@yahoo.it wrote:
Hi, i need to draw a plot with means of values, reading a table from
datafile.
Example of datafile:
Days Weight
0 178.00
0 250.00
0 242.00
0 239.00
0 223.00
0 188.00
0 237.00
0 212.00
0 273.00
0 191.00
0 173.00
0 233.00
0 227.00
0 253.00
0 232.00
4 177.00
4 249.00
4 241.00
4 238.00
4 222.00
4 188.00
4 236.00
4 211.00
4 272.00
4 190.00
4 172.00
4 232.00
4 226.00
4 252.00
4 231.00
if i use plot(Weight~Days, data=la) the result is this
http://r.789695.n4.nabble.com/file/n3031068/weightm.jpg
how can i draw a plot with means for each days?
tnx for help :)
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--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/
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and provide commented, minimal, self-contained, reproducible code.
