Dear Michael (and Davis), Your answer is not what I want to know. My question is to find any command to plot the data I got from the field; such as a set of (x,y) data ( I actually have these data) and together withe the derived ones . I brought these data to plot on x-y plane, getting a graph showing some relation. Then, I wanted to find some linear relation, I would use least square method to solve having a simple function such as; y = ax + b, solving the a and b. So, I could plot a straight line using this function, or perhaps forecast some data of y which I know the value x. My problem is when I did a scatter plot by command "plot(x,y)", I got a graph. Whilst I plotted another graph using the above function the existing graph disappeared replaced be the latter function. Unfortunately, after searching a while to find the solution command, I can not find the command. I asked the question as to request some help not the example you shown. Any way, thanks for you effort. Ta! wee Mac OS10.7.3 > From: michael.weyla...@gmail.com > Date: Tue, 10 Apr 2012 23:31:08 -0400 > Subject: Re: [R] plot 2 graphs on the same x-y plane > To: ohowow2...@hotmail.com > CC: r-help@r-project.org > > This is the same malformatted message you posted on R-SIG-Mac even > after David specifically asked for clarification.... not to reward bad > behavior, but perhaps this will enlighten: > > # Minimal reproducible data! > x <- runif(15, 0, 5) > y <- 3*x - 2 + runif(15) > > dat <- data.frame(x = x, y = y) > rm(list = c("x", "y")) > > # Base graphics plot using the formula interface > plot(y ~ x, data = dat) > abline(lm(y~x, data = dat), col = "red3", lwd = 2) > > Alternatively > > library(ggplot2) > ggplot(dat, aes(x = x, y = y)) + geom_point() + stat_smooth(method = > "lm", color = I("red3")) > > which is perhaps overkill in this situation. > > > Michael > > On Tue, Apr 10, 2012 at 11:03 PM, Tawee Laoitichote > <ohowow2...@hotmail.com> wrote: > > > > > > > > > > hi, I'm doing some data on least square curve fitting. What I like to have > > is to compare the scatter plot whilst having the fitting curve on the same > > coordinates. Any suggestting command besides plot(x,y). TaweeMac OSX 10.7.3 > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.