Hi! You forgot to invert the slope: a perpendicular of 1/sqrt(2) should be -sqrt(2). Also, you should add asp=1 in the plot command to lock the aspect ratio, otherwise the scale of both X and Y may be different according to the size of the window: plot(x=c(-1, 1), y=c(-1, 1),asp=1); abline(a=0, b=1/sqrt(2)); abline(a=0, b=-sqrt(2))
Miguel On Mon, Mar 22, 2010 at 11:13 AM, Martin Ivanov <tra...@abv.bg> wrote: > Dear R users, > > I need to plot to perpendicular straight lines. However, although I set the > coefficients > so that the lines are perpendicular, they do not look to be so in the plot. > Here is a minimal working example: > plot(x=c(-1, 1), y=c(-1, 1)); abline(a=0, b=1/sqrt(2)); abline(a=0, > b=-1/sqrt(2)) > > Please tell me if the same problem is valid by you. I am running R-2.10.1 > on Linux. > > Is there a way out of this? > > Regards, > > Martin > > ______________________________________________ > 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.
