rrapache

Using plots within rApache

I'm working with rApache for displaying encapsulated plots that were created in R. Right now there's only one problem that I have to face. If there's only nest R code within the document, the HTML file get's rendered as some kind of single png image I think.

However, I want that it gets renderd as a document that contains graphical plots. So when I add HTML content before or within the <% ... %> Tags, I get an broken image sign as an output.

How can I make it happen, that I can use the plot command within an HTML document?

<h1> Plot Content </h1> // adding this causes a broken image

<%
setContentType("image/png")
 t  <- tempfile() 
png(t,type="cairo") 

rndDistribution <- rnorm(100)

 plot(rndDistribution) 

 dev.off() 
sendBin(readBin(t,'raw',n=file.info(t)$size)) 
unlink(t)
%>

My apache.conf:

<Directory /var/www/>
    Options Indexes FollowSymLinks
    AllowOverride All
    Require all granted
</Directory>


<Directory /var/www/html/R>
    SetHandler r-script
    RHandler brew::brew
</Directory>
Solution

  • After reading a bit about file creation in R, I came to the following solution as a very simple workaround:

    // 1. creating the image of the plotted diagramm:
<%
setwd("/var/www/html/images/R")
getwd()
png(filename="plot.png")

rndDistribution <- rnorm(100)

plot(rndDistribution) 

dev.off() 
%>

// 2. display graphic:
<h1> Plot Content </h1>
<img src="/images/R/plot.png">

    I guess the first code example I've tried was made for a R-Handler for documents, rather than the r-script option within an specific directory.