Dear Mark, Thanks for your reply.
I attach one of my plots as an example (e.g.Mafalda) to show what I want. If you notice in the plot the x-axis has a funny scale (0, 13, 28...) and what I would like to do is to make that scale from 0 and then increasing by 25 km for a better interpretation (0, 25, 50...). Hopefully my problem is more clear now, meanwhile I will have a look to your suggestions. Thank you very much Mafalda 2009/3/22 Marc Schwartz <marc_schwa...@comcast.net> > On Mar 22, 2009, at 2:31 PM, Mafalda Viana wrote: > > Dear R users, >> >> I am trying to build a barplot2 graph however I can't find a way of >> defining >> the scale for the x-axis. >> >> I would like to show in my x-axis only the numbers 0, 25, 50, 75 etc. (so >> far R is giving me a random scale hard to interpret and it doens't look >> nice...). Could anyone advise me on how to do this please, it would be a >> great help! Thank you. >> >> Below I show the code I have been using for my plots. >> >> my.plot<- barplot2(mydata.y, names.arg=mydata.x, width=1, >> xlab="km", ylab="kg", main="plot.name", >> plot.ci=TRUE, ci.l=data.lci,ci.u=data.uci, ci.col = "red", font=40, >> font.lab=60, xlim=c(0,250), xpd=FALSE) >> > > > It is not entirely clear what you are doing here an we cannot reproduce it > lacking your data. > > Your x (horizontal) axis will have one tick mark below each bar, using the > labels that you have indicated with mydata.x. Based upon your code, the x > axis values would appear to be measures of distance. > > Your y (vertical) axis would appear to be a measure of weight, perhaps > being some descriptive statistic (eg. mean) for weight at each distance. > > It is unclear what you want to do with the x axis in lieu of the default > values. Modifying the tick marks on the y axis would seem to make more sense > here. > > In general, with any R graphic, you would use the arguments 'xaxt = "n"' > and/or 'yaxt = "n"' to disable the default drawing of the x and y axes, > respectively. You would then call the axis() function passing the specific > locations and values of the tick marks that you wish to draw. See ?par and > ?axis for more information on these. > > BTW if you are not plotting counts or proportions/percentages, then a > barplot is not the best approach for the display of summarized continuous > data. I would use a point plot with error bars/confidence intervals. See the > errbar() function in the Hmisc package or the plotCI() or plotmeans() > functions in gplots. You could also create something manually by using > plot() and then either segments() or arrows() for the CIs. > > HTH, > > Marc Schwartz > > > -- Mafalda Viana
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