Hi, You actually did the loop correctly. The problem is that the graphs were created very quickly so you only see the last one. One way around this is to make R wait for user input. You can turn this on and off for a particular device using:
par(ask = TRUE) See ?par for details on this. To create the various files in a for loop, you actually do not need this. You should be able to get by with something like: png(filename = "Graph%03d.png") for(i in 1:4){ qplot(x[i]<-mydata[,i]) } dev.off() Hope this helps! Josh On Tue, Jul 12, 2011 at 12:21 PM, wwreith <reith_will...@bah.com> wrote: > I have 4 columns and 56 rows of made up data that I want to plot as a series > of bar graphs. The idea is to create one bar graph for each of the 4 columns > using a for loop. I tried the following command in RStudio and when I type x > in the console I get just the 4th graph instead of all four graphs. I did > not define what x is before hand. I was not sure what it would be. Any > suggestions on how you would properly define x? > > for(i in 1:4){ > qplot(x[i]<-mydata[,i]) > } > > The headers of the columns are Trial.1 Trial.2 Trial.3 and Trial.4. Also > note that I can easily make any of the four graphs by > > i=1 or i=2, etc. > qplot(x<-mydata[,i]) > > I just need to figure out how to make it loop correctly. The ultimate goal > would also be to save these graphs to my computer with automatically > generated file names. Something like test graph1.png, test graph2.png, etc. > > Thanks For The Help! > > -- > View this message in context: > http://r.789695.n4.nabble.com/qplot-and-for-loops-tp3663292p3663292.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. > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles https://joshuawiley.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.