Try this: x <- seq(-100,1000,25) y <- x * x plot(x, y, xaxt = "n") axis(1, x[x %% 100 == 0])
On 8/11/06, Darren Weber <[EMAIL PROTECTED]> wrote: > Hi, > > I'm stuck on creating a plot with x tick labels for every Nth tick > mark - how is that done? I don't see a simple solution to this in > help(plot) or help(par) and what I've tried is not working, eg, the > following does not work, although it seems intuitive to me that it > should work: > > x <- seq(-100,1000,25) > y <- x * x > % find all the x values that are multiples of 100 > tmp <- x / 100 > tmp <- tmp %% 1 > tmp <- tmp > 0 > % set all other values to null strings > xtickLabels <- as.character( x ) > xtickLabels[tmp] <- "" > plot(x, y, xlab=xtickLabels) > > > These commands look like this (the plot is not right): > > > x <- seq(-100,1000,25) > > x > [1] -100 -75 -50 -25 0 25 50 75 100 125 150 175 200 225 > 250 > [16] 275 300 325 350 375 400 425 450 475 500 525 550 575 600 > 625 > [31] 650 675 700 725 750 775 800 825 850 875 900 925 950 975 > 1000 > > > > tmp <- x / 100 > > tmp > [1] -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 > [13] 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 > [25] 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 > [37] 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 > > > > tmp <- tmp %% 1 > > tmp > [1] 0.00 0.25 0.50 0.75 0.00 0.25 0.50 0.75 0.00 0.25 0.50 0.75 0.00 0.25 > 0.50 > [16] 0.75 0.00 0.25 0.50 0.75 0.00 0.25 0.50 0.75 0.00 0.25 0.50 0.75 0.00 > 0.25 > [31] 0.50 0.75 0.00 0.25 0.50 0.75 0.00 0.25 0.50 0.75 0.00 0.25 0.50 0.75 > 0.00 > > > > tmp <- tmp > 0 > > tmp > [1] FALSE TRUE TRUE TRUE FALSE TRUE TRUE TRUE FALSE TRUE TRUE TRUE > [13] FALSE TRUE TRUE TRUE FALSE TRUE TRUE TRUE FALSE TRUE TRUE TRUE > [25] FALSE TRUE TRUE TRUE FALSE TRUE TRUE TRUE FALSE TRUE TRUE TRUE > [37] FALSE TRUE TRUE TRUE FALSE TRUE TRUE TRUE FALSE > > > > xtickLabels <- as.character( x ) > > xtickLabels > [1] "-100" "-75" "-50" "-25" "0" "25" "50" "75" "100" "125" > [11] "150" "175" "200" "225" "250" "275" "300" "325" "350" "375" > [21] "400" "425" "450" "475" "500" "525" "550" "575" "600" "625" > [31] "650" "675" "700" "725" "750" "775" "800" "825" "850" "875" > [41] "900" "925" "950" "975" "1000" > > > > xtickLabels[tmp] <- "" > > xtickLabels > [1] "-100" "" "" "" "0" "" "" "" "100" "" > [11] "" "" "200" "" "" "" "300" "" "" "" > [21] "400" "" "" "" "500" "" "" "" "600" "" > [31] "" "" "700" "" "" "" "800" "" "" "" > [41] "900" "" "" "" "1000" > > > > y <- x * x > > y > [1] 10000 5625 2500 625 0 625 2500 5625 10000 > [10] 15625 22500 30625 40000 50625 62500 75625 90000 105625 > [19] 122500 140625 160000 180625 202500 225625 250000 275625 302500 > [28] 330625 360000 390625 422500 455625 490000 525625 562500 600625 > [37] 640000 680625 722500 765625 810000 855625 902500 950625 1000000 > > > > plot(x, y, xlab=xtickLabels) > > > > > Thanks in advance. > > Best, Darren > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > ______________________________________________ R-help@stat.math.ethz.ch 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.