[R] looping multipanel plots to different figures

[Jim Lemon]

Hi efisio,
Okay, you can switch devices using the dev.* functions in the grDevices
package. If you only have two devices open at one time, this is not too
difficult:

#open both devices
png(...)
par(mfrow=c(1,2))
png(...)
par(mfrow=c(1,2))
hist(...)
dev.set(dev.next())
hist(...)
dev.set(dev.next())
# after end of loop
dev.off()
dev.off()

to switch devices. Remember to shut both down when the loop is complete.

Jim


Jim


On Thu, Feb 19, 2015 at 9:16 PM, efisio solazzo <
efisio.solazzo at jrc.ec.europa.eu> wrote:

>  Thanks Jim,
> actually I need to keep open two devices at the same time, and within the
> loop access either of them in alternation. In MatLab there is the command
> Figure(#) which keeps track of the open devices and direct the output of
> the plot to whichever of them.
>
> For example:
> plot_filenames<-c("plot1.png","plot2.png","plot3.png")
> for (i in 1:5) {
>  png(plot_filenames[1])
>  par(mfrow=c(1,2))
>  hist(sample(i:10,30,TRUE)) #???
>  png(plot_filenames[2]) #???
>  par(mfrow=c(1,2))
>  hist(sample(i+1:15,30,TRUE))
>  dev.off() #???
> }
>
> Hope I've been clear.
>
> Thanks, Efisio
> ===========================================
>
>
>
> On 19/02/2015 10:36, Jim Lemon wrote:
>
> Hi efisio,
> I read this as wanting to start a new graphics device, then set some plot
> parameters, display two plots and then close the graphics device at each
> iteration of the loop. If so,
>
> plot_filenames<-c("plot1.png","plot2.png","plot3.png")
> for(plotfn in plot_filenames) {
>  png(plotfn)
>  par(mfrow=c(1,2))
>  hist(sample(1:5,30,TRUE))
>  hist(sample(1:5,30,TRUE))
>  dev.off()
> }
>
>  Jim
>
>
>
> On Thu, Feb 19, 2015 at 7:25 PM, efisio solazzo <
> efisio.solazzo at jrc.ec.europa.eu> wrote:
>
>> Dear,
>> cannot find  a way to direct multipanel plots to different figures
>> (files) while within a loop.
>>
>> Say, the loop creates two plots each step: one plot should go to figure 1
>> and the other to  figure 2.
>> Same for the next steps of the loop: the plots should go to figure 1 and
>> figure 2 in a multipanel fashion.
>>
>> I am not sure at which point to open the files and set the multipanel
>> parameters...all I can get is two files with all plots overlaid to the same
>> position.
>>
>> Thanks
>>
>> ______________________________________________
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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.
>>
>
>
>
> --
> Efisio SOLAZZO, Ph.D.
> European Commission, Joint Research Centre,
> Institute for Environment and Sustainability,
> TP123, Via E. Fermi, 2749 I-21027 Ispra (VA), Italy
> Tel: +390332789944 Fax: +390332785837
>
>

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