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Tutorial 5 is all about <code>pbdZMQ+remoter</code> packages using
Linux as a server and windows as a client. The server generates
a plot but the client displaies the plot.
The server has ip address "192.168.56.101" which is a xubuntu system
run in a VM where the host is Windows 8.
A newer demo can be found on my github repo at
<a href="https://github.com/snoweye/user2016.demo"
target="_blank">snoweye/user2016.demo</a> or in next.
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The next may be out of date but shows the main idea.
The server commands are to show ip address and run a server (remoter) as
```
SHELL> ifconfig enp0s8
SHELL> Rscript -e "remoter::server()"
```
The client code is to generate two plots on the server but display on the local
devices. The code is as simple as the next.
```
R> library(remoter, quietly = TRUE)
R> client("192.168.56.101")
remoter> a <- function() plot(1:5)
remoter> rrpng(a)
remoter> dev.newc()
remoter> b <- function() plot(iris$Sepal.Length, iris$Petal.Length)
remoter> rrpng(b)
remoter> dev.curc()
remoter> dev.offc(2)
remoter> dev.offc(3)
remoter> q()
```
For plotting in R, the ubuntu/xubuntu may need a virtual X11 client `xvfb` and
X11 adobe fonts. One may install them by
```
sudo apt-get install xvfb
sudo apt-get install t1-xfree86-nonfree ttf-xfree86-nonfree ttf-xfree86-nonfree-syriac xfonts-75dpi xfonts-100dpi
```
This will be considerably useful for most of Windows users.
For example, the `remoter` server is launched externally
from a `remoter` client where X11 servers are not available or X forwarding
is not enable or allowed.
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