title: Change Jupyter R-Kernel engine from 32 bit to 64 bit easily
body: <p>I'm using Jupyter with R Kernel to create training forms.
  With some packages of R, I need to use a 32 bit release of R engine, and for others (the main part) 64 bit.</p>
  
  <p>So my goal is to be able to switch really easily from a R Kernel 32 bit to a R Kernel 64 bit really easily.</p>
  
  <p>From now on, the only thing I've been able to do is</p>
  
  <ul>
  <li>getting a 32 bit R Kernel Under Jupyter when I previously installed the Kernel Under a 32bit version of my R engine  </li>
  <li>getting a 64 bit R Kernel when previously installed the packages and the R Kernel Under a 64 bit R engine </li>
  </ul>
  
  <p>To install the Kernel, my code is always the same : </p>
  
  <pre><code>    install.packages(c('repr', 'IRkernel', 'IRdisplay'),
       repos = c('http://irkernel.github.io/', getOption('repos')))
  IRkernel::installspec()
  </code></pre>