Cheers Marc, it works perfectly now. Thanks for your help!
Marc Schwartz wrote: > > You can generalize the approach by using something like: > > ... > ylim = c(0, max(DF$TACC, DF$Catch) * 1.1) > ... > > > That would allow you to use the max value of the two columns, multiplied > by a fudge factor, which you can adjust as needed. In this case, > increasing the y axis range by 10% to make room. > > HTH, > > Marc > > on 01/07/2009 02:31 PM jimdare wrote: >> Thanks Marc, that has helped a lot. Say, for example, in a situation >> where I >> can't find out the highest value, is there any way to get R to >> automatically >> detect this and adjust the axis accordingly? I am planning to do this >> for >> many different stocks at once and dont wan't to have to define the >> highest >> value for each. I could set a standard axis value based on the max >> values >> of all stocks, however the detail will be lost for many of the less >> exploited species. >> >> >> Marc Schwartz wrote: >>> on 01/06/2009 09:07 PM jimdare wrote: >>>> Hi Everyone, >>>> >>>> Have created a bar plot of the data below using the following code: >>>> barplot(TACC,space=0,names.arg=Year). I now want to add a series of >>>> connected points to represent the catch. I tried to do this using >>>> line(Catch) or points(Catch), however both of these commands result in >>>> each >>>> data point being aligned with the right edge of each bar. I need them >>>> to >>>> be >>>> solid points in the centre of each bar, and for each point to be >>>> connected >>>> to its neighbour by a line. Another issue I have is when the points >>>> exceed >>>> the values for the bar graph (e.g. in 2004 and 2005 catch>TACC) R seems >>>> to >>>> cut them off, I need the axis to be expanded so they can be seen. I'm >>>> sure >>>> these are relatively simple problems but I am really stuck. Thanks >>>> very >>>> much for all your help, it is much appreciated. >>>> >>>> James >>>> >>>> DATA: >>>> >>>> Year Species Stock TACC Catch >>>> 1 2001 ORH OR1 5000 4687 >>>> 2 2002 ORH OR1 6000 3215 >>>> 3 2003 ORH OR1 7000 6782 >>>> 4 2004 ORH OR1 9000 10000 >>>> 5 2005 ORH OR1 9000 12000 >>> One key point to note is that barplot() returns the bar midpoints. This >>> is noted in the help for barplot(). The bars are not centered on integer >>> axis values, so you need the returned values to place additional >>> annotation in the proper location relative to the bars. >>> >>> The other thing is to set the range of the y axis using the maximum >>> value in Catch, plus some fudge, so that the plot covers both sets of >>> data and has enough room for the additional points. >>> >>> Thus, presuming that your data is in a data frame called 'DF': >>> >>> mp <- barplot(DF$TACC, space = 0, names.arg = DF$Year, >>> ylim = c(0, 13000)) >>> >>> # Now use lines() to add Catch >>> lines(mp, DF$Catch, type = "b", pch = 19) >>> >>> See ?barplot, ?lines and ?points for more information. >>> >>> HTH, >>> >>> Marc Schwartz >>> > > ______________________________________________ > 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. > > -- View this message in context: http://www.nabble.com/Bar-Plot-with-Connected-Points-on-1-Y-Axis-tp21324029p21362442.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
