R by default puts the axes at the edge of the plot, not at x=0 and y=0, for the reason that doing otherwise makes the plot harder to read. To see this, consider:
plot( c( -4, 0, 4 ), c( 0, 1, 1 ), type="s", xlab="x", ylab="y", axes=FALSE, xlim=c( -5, 5 ), ylim=c( -2, 2 ), lwd=2 ) axis( side=1, at=seq( -4, 4, 1 ), pos=0 ) axis( side=2, at=seq( -2, 2, 1 ), pos=0 ) You should read the help pages ?plot.default ?axis -- Sent from my phone. Please excuse my brevity. On February 7, 2016 2:54:48 PM PST, jupiter <jupiter....@gmail.com> wrote: >Thanks Jim, that was I did to generate graphic from >plot(c(-4,0,4),c(0,1,1),type="s",xlab="x",ylab="y"), it displayed [-4, >-2, >0, 2, 4] in X, I tried to twist it, but could not get [-4, -3, -2, -1, >0, >1, 2, 3, 4] in X. Also, that the y 0.0 is above the X axis. > >I guess I try to figure out if, in general, there are parameters to >define >Δx (i.e Δx= 1), and to define [0, 0.0] at the joint of x axis and y >axis. >But never mind, if it is too much to ask :-). > >Thank you and greatly appreciate kind responses. > >- j > > > >On Mon, Feb 8, 2016 at 8:19 AM, Jim Lemon <drjimle...@gmail.com> wrote: > >> Hail Jupiter, >> Might a slight alteration of Rolf's suggestion do the trick? >> >> plot(c(-4,0,4),c(0,1,1),type="s",xlab="x",ylab="y") >> >> Jim >> >> On Sun, Feb 7, 2016 at 8:49 AM, jupiter <jupiter....@gmail.com> >wrote: >> >>> Thank you for the all response, how can the point y (0.0) on the >same x >>> axis, and X increases 1 between [-4, 4]? >>> >>> On Sun, Feb 7, 2016 at 5:29 AM, Rolf Turner ><r.tur...@auckland.ac.nz> >>> wrote: >>> >>> > On 07/02/16 01:11, jupiter wrote: >>> > >>> >> Hi, >>> >> >>> >> I am just starting to learn R, sorry for asking a simple >question. How >>> can >>> >> plot a line x <= 0 y = 0, x > 0 y = 1? >>> >> >>> > >>> > One way: >>> > >>> > plot(c(-1,0,1),c(0,1,1),type="s",xlab="x",ylab="y") >>> > >>> > cheers, >>> > >>> > Rolf Turner >>> > >>> > -- >>> > Technical Editor ANZJS >>> > Department of Statistics >>> > University of Auckland >>> > Phone: +64-9-373-7599 ext. 88276 >>> > >>> >>> [[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. >>> >> >> > > [[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. [[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.
