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
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> 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/
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