title: Plot piecewise data, x-axis limits
body: <p>I use Julia with Plots , to generate my plots. </p>
  
  <p>I want to plot data (A,B) and i know that all interesting data lies in two region of A. The two regions should be plotted between each other in one plot. 
  My A-data is evenly spaced. So what i did was cutting out my interesting pieces and glued them into one object. </p>
  
  <p>My problem is that i don't know how to manipulate the scale on the x-axis.
  When I just plot the B data against their array index, I basically get the form I want. I just need the numbers from A on the x-axis.</p>
  
  <p>I give here a toy example </p>
  
  <pre><code>using Plots
  
  N=5000
  B=rand(N)
  A=(1:1:N)
  xl_1=100
  xu_1=160
  xl_2=600
  xu_2=650
  
  A_new=vcat(A[xl_1:xu_1],A[xl_2:xu_2])
  B_new=vcat(B[xl_1:xu_1],B[xl_2:xu_2])
  
  plot(A_new,B_new)     # This leaves the spacing between the data explicit
  
  plot(B_new)           # This creats basically the right spacing, but   
                        # without the right x axis grid
  </code></pre>
  
  <p>I did not find anything how one can use two successive xlims, therefore i try it this way.</p>