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 <js3...@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@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 ddalth...@usgs.gov [[alternative HTML version deleted]] ______________________________________________ R-help@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.
