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

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

On Sun, Aug 26, 2012 at 10:15 PM, John Hendy <jw.hendy@gmail.com> wrote:
> 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.

Disregard again... adding multiple newlines with cat() doesn't work,
but I had the idea to do:

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

Works great. I suppose I can use this to add #+attr_latex options as
well as captions. Cool stuff.

Thanks!

>
>
> 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