Hi, there I am new on R. I want to plot a graph like this. The curves are created by these equations : (log(0.4)-(0.37273*log(x)-1.79389))/0.17941, (log(0.5)-(0.37273*log(x)-1.79389))/0.17941, (log(0.6)-(0.37273*log(x)-1.79389))/0.17941, etc. The equations are similar, the only difference is the first log(XXX). I already manually draw the graph by repeating plot() for each equation. But I think there must be a way to just assign a simple variable like x<-c(0.4,0.5,0.6,0.7), and then plot all the curves automatically. I tried to use data frame to make a set of equations, but failed. Could somebody help me? Thank you very much! -------------- next part -------------- A non-text attachment was scrubbed... Name: QQ??20160302113702.png Type: image/png Size: 85043 bytes Desc: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20160302/6223ee5d/attachment.png>
A simple solution that will give you an idea of some of the plot parameters: x<-seq(1,10,length=1000) # values for x-axis x0<-c(0.4,0.5,0.6,0.7) miny<-(log(min(x0))-(0.37273*log(max(x))-1.79389))/0.17941 # minimum y-value to show on graph maxy<-(log(max(x0))-(0.37273*log(min(x))-1.79389))/0.17941 # maximum y-value to show on graph plot(1,1, xlim=range(x), ylim=c(miny,maxy), type='n') # a blank figure to put lines on for (i in x0) lines(x,(log(i)-(0.37273*log(x)-1.79389))/0.17941) # putting the lines on On Wed, Mar 2, 2016 at 9:03 AM, Jinggaofu Shi <js3786 at drexel.edu> wrote:> Hi, there I am new on R. I want to plot a graph like this. > > The curves are created by these equations : > (log(0.4)-(0.37273*log(x)-1.79389))/0.17941, > (log(0.5)-(0.37273*log(x)-1.79389))/0.17941, > (log(0.6)-(0.37273*log(x)-1.79389))/0.17941, etc. The equations are > similar, the only difference is the first log(XXX). I already manually draw > the graph by repeating plot() for each equation. But I think there must be > a way to just assign a simple variable like x<-c(0.4,0.5,0.6,0.7), and then > plot all the curves automatically. I tried to use data frame to make a set > of equations, but failed. Could somebody help me? Thank you very much! > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. >-- Dan Dalthorp, PhD USGS Forest and Rangeland Ecosystem Science Center Forest Sciences Lab, Rm 189 3200 SW Jefferson Way Corvallis, OR 97331 ph: 541-750-0953 ddalthorp at usgs.gov [[alternative HTML version deleted]]
Or, if you want easy labels, you can play around with contour graphs. ?contour # will give you info on how to make contour plots The basic idea is to construct a matrix of z-values...one z for every combination of x and y contour(x,y,z) The x's would then be the x-values you want in (0.37273*log(x)-1.79389))/0.17941 for whatever range of x's you want The y's would be values from -5 to 5 (or whatever range you want) The z's would be values like 0.4, 0.5, etc. or exp(y + x) ?outer # will tell you how to create z from x and y x<-seq(1,10,length=100) # values for x-axis y<-seq(2, 10, length=100) # values for y-axis z<-exp(outer((0.37273*log(x)-1.79389)/0.17941,y,"+")) contour(x,y,z,levels=seq(.1,1.1,by=.1)) -Dan On Wed, Mar 2, 2016 at 9:03 AM, Jinggaofu Shi <js3786 at drexel.edu> wrote:> Hi, there I am new on R. I want to plot a graph like this. > > The curves are created by these equations : > (log(0.4)-(0.37273*log(x)-1.79389))/0.17941, > (log(0.5)-(0.37273*log(x)-1.79389))/0.17941, > (log(0.6)-(0.37273*log(x)-1.79389))/0.17941, etc. The equations are > similar, the only difference is the first log(XXX). I already manually draw > the graph by repeating plot() for each equation. But I think there must be > a way to just assign a simple variable like x<-c(0.4,0.5,0.6,0.7), and then > plot all the curves automatically. I tried to use data frame to make a set > of equations, but failed. Could somebody help me? Thank you very much! > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. >-- Dan Dalthorp, PhD USGS Forest and Rangeland Ecosystem Science Center Forest Sciences Lab, Rm 189 3200 SW Jefferson Way Corvallis, OR 97331 ph: 541-750-0953 ddalthorp at usgs.gov [[alternative HTML version deleted]]
Another way would be to use matplot() or matlines():> lx<-c(0.4, 0.5, 0.6, 0.7) > x <- seq(1, 8, length.out=100) > myfun <- function(x, k) {(log(k)-(0.37273*log(x)-1.79389))/0.17941} > y <- sapply(lx, function(k) myfun(x, k)) > matplot(x, a, type="l", col="black", lty=1)------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Dalthorp, Daniel Sent: Wednesday, March 2, 2016 1:05 PM To: Jinggaofu Shi Cc: r-help at R-project.org (r-help at r-project.org) Subject: Re: [R] Plot multiple similar equations in r Or, if you want easy labels, you can play around with contour graphs. ?contour # will give you info on how to make contour plots The basic idea is to construct a matrix of z-values...one z for every combination of x and y contour(x,y,z) The x's would then be the x-values you want in (0.37273*log(x)-1.79389))/0.17941 for whatever range of x's you want The y's would be values from -5 to 5 (or whatever range you want) The z's would be values like 0.4, 0.5, etc. or exp(y + x) ?outer # will tell you how to create z from x and y x<-seq(1,10,length=100) # values for x-axis y<-seq(2, 10, length=100) # values for y-axis z<-exp(outer((0.37273*log(x)-1.79389)/0.17941,y,"+")) contour(x,y,z,levels=seq(.1,1.1,by=.1)) -Dan On Wed, Mar 2, 2016 at 9:03 AM, Jinggaofu Shi <js3786 at drexel.edu> wrote:> Hi, there I am new on R. I want to plot a graph like this. > > The curves are created by these equations : > (log(0.4)-(0.37273*log(x)-1.79389))/0.17941, > (log(0.5)-(0.37273*log(x)-1.79389))/0.17941, > (log(0.6)-(0.37273*log(x)-1.79389))/0.17941, etc. The equations are > similar, the only difference is the first log(XXX). I already manually draw > the graph by repeating plot() for each equation. But I think there must be > a way to just assign a simple variable like x<-c(0.4,0.5,0.6,0.7), and then > plot all the curves automatically. I tried to use data frame to make a set > of equations, but failed. Could somebody help me? Thank you very much! > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. >-- Dan Dalthorp, PhD USGS Forest and Rangeland Ecosystem Science Center Forest Sciences Lab, Rm 189 3200 SW Jefferson Way Corvallis, OR 97331 ph: 541-750-0953 ddalthorp at usgs.gov [[alternative HTML version deleted]] ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.