title: How to make a histogram from a matrix in R
body: <p>I`m having trouble constructing an histogram from a matrix in R
  The matrix contains 3 treatments(lamda0.001, lambda0.002, lambda0.005 for 4 populations rec1, rec2, rec3, con1). The matrix is:</p>
  
  <pre><code>     lambda0.001 lambda0.002 lambda.003
  rec1   1.0881688   1.1890554  1.3653264
  rec2   1.0119031   1.0687678  1.1751051
  rec3   0.9540271   0.9540271  0.9540271
  con1   0.8053506   0.8086985  0.8272758
  </code></pre>
  
  <p>my goal is to plot a histogram with lambda in the Y axis and four groups of three treatments in X axis. Those four groups should be separated by a small break from eache other.
  I need help, it doesn`t matter if in ggplot2 ou just regular plot (R basic).
  Thanks a lot!</p>