Re: Including multiple plots resulting from a loop of R code in LaTeX

[John Hendy <jw.hendy@gmail.com>]

On Thu, Aug 23, 2012 at 11:43 AM, Eric Schulte <eric.schulte@gmx.com> wrote:
> John Hendy <jw.hendy@gmail.com> writes:
>
>> I'm conducting some neural network analysis, and the results are
>> highly dependent on the random seed set prior to creating the model. I
>> loop through seeds 1-500, storing the predicted values in one data
>> frame and a table of mean sum of squared errors in another table.
>>
>> Then, I use ggplot to create only the 10 or so plots with the lowest
>> error. The loop is something like this:
>>
>> ----------
>> for(i in 1:10) {
>>
>> filename <- paste("neuralnet-","-seed-",as.character(mse[i,1]),".pdf", sep="")
>>
>> pdf(filename, width=12, height=8)
>>
>> [ggplot code]
>>
>> dev.off()
>> ----------
>>
>> What I want to know is how to include the resultant files in LaTeX
>> export. Since my model runs and then sorts by error, I don't know
>> which seeds produce the best files beforehand, so I'd have to look at
>> the error table and manually insert the plot names by hand. Changing
>> results means changing file names by hand again.
>>
>> Any suggestions for things like this where the output of a babel block
>> is not a single file?
>>
>
> Have you tried using header arguments like the following.
>
> :results output raw :exports results
>
> and then printing the file names (including the Org-mode link syntax) to
> STDOUT from within your R code block.

Disregard the previous. I found that I should be using cat(paste(...))
instead of print(), since that removes the [1] from each line.
Unfortunately,

,---
| cat(paste("[[../plots/",filename,"]]",sep=""), sep="\n\n")
`---

still gives me output in orgmode of filenames with no new lines in
between so my plots are being printed 4-up on a page (2 wide, 2 tall)
instead of only 1 wide and 2 tall. If I manually enter new lines in
between the output file names, they behave as they should. How do I
get org to accept the extra newlines I'm trying to add? Executing in
the R session itself behaves as expected and does space the lines.


Thanks,
John

>
> If I understand correctly that should result in the behavior you're
> after.
>
> Best,
>
>>
>>
>> Thanks,
>> John
>>
>
> --
> Eric Schulte
> http://cs.unm.edu/~eschulte