Fantastic. You're right, I was looking for seq(). However, my plan for using it for hist() was foiled!
I thought if I did something like: > b <- seq(0,500,10) > hist(myvble,breaks=b) It would bin myvble into the bins 0-50,50-100,100-150 etc and in that way I could ensure that two histograms are on the same scale with the same bins! I get the following error: Error in hist.default(Cy5, breaks = s) : some 'x' not counted; maybe 'breaks' do not span range of 'x' Now this makes sense of course, my bins probably DON'T span the entire range of X. SOOOOO I am still left with the same problem: 1) two variables 2) I want to draw histograms of both 3) I want them to have the SAME x-y scale on the graph 4) I want them to have the SAME bin range How do i do it? Any suggestions? Cheers Mick -----Original Message----- From: Hotz, T. [mailto:[EMAIL PROTECTED] Sent: 03 July 2003 14:16 To: michael watson (IAH-C); [EMAIL PROTECTED] Subject: RE: [R] Generating a vector for breaks in a histogram Dear Mick, Have a look at ?seq - seq(1,20,length=20) should do it. HTH Thomas --- Thomas Hotz Research Associate in Medical Statistics University of Leicester United Kingdom Department of Epidemiology and Public Health 22-28 Princess Road West Leicester LE1 6TP Tel +44 116 252-5410 Fax +44 116 252-5423 Division of Medicine for the Elderly Department of Medicine The Glenfield Hospital Leicester LE3 9QP Tel +44 116 256-3643 Fax +44 116 232-2976 > -----Original Message----- > From: michael watson (IAH-C) [mailto:[EMAIL PROTECTED] > Sent: 03 July 2003 14:02 > To: '[EMAIL PROTECTED]' > Subject: [R] Generating a vector for breaks in a histogram > > > Hi > > I have two lots of numbers which I would like to histogram > using the hist() function. For comparative reasons, I want > them to be on the same scale, which I can use the xlim and > ylim options to achieve. > > However, having them on the same scale is meaningless unless > they have the same "breaks". Consulting the documentation, > there are 4 ways of defining the number of breaks, only one > of which is "definite", the others merely form suggestions, > which I have found is not good enough. > > The only definite way is to provide a vector to the hist() > function which is a vector of the break points for the > histogram. So I need to generate a vector that contains say, > 500, numbers in it, equi-distance apart between a min and a max. EG: > > > myfunc(n=20,min=1,max=20) > > would provide a vector, length 20, with the numbers 1 through > 20 in it. > > Is there a function in R that can do this? > > Thanks > Mick > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help