plot 2 graphs on the same x-y plane
Hi, A line can be added to an existing plot using the abline function. For example, if a is the intercept and b is the slope, the command would be abline(a=a, b=b) To overlay a new plot on an existing one, use the command: par(new=TRUE). For example: plot(1:10, 1:10) par(new=TRUE) plot(log(1:10), 1:10) This approach often leads to issues with the scale of the axes, tick marks, and labels. Fortunately, R provides the flexibility to deal with all of them. I recommend you carefully read the help pages for plot, par, and axis, and have some fun playing around with all the options. --Susan
On Apr 10, 2012, at 11:55 PM, Tawee Laoitichote wrote:
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.weylandt at gmail.com
Date: Tue, 10 Apr 2012 23:31:08 -0400
Subject: Re: [R] plot 2 graphs on the same x-y plane
To: ohowow2007 at hotmail.com
CC: r-help at 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
<ohowow2007 at 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 at 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-SIG-Mac mailing list R-SIG-Mac at r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac