title: All points y value undefined on gnuplot
body: <p>Why when i make this code of gnuplot it's work :</p>
  
  <pre><code>set terminal postscript enhanced color
  set output '../figs/ins_local.ps'
  
  set title "Result"
  
  set logscale y
  set xrange [50:100]
  set xtics 5
  
  #set xlabel "Insertion"
  #set ylabel "Time (in microseconds) "
  
  plot sin(x)
  </code></pre>
  
  <p>but when i change <code>plot sin(x)</code> with :</p>
  
  <pre><code>plot "../myFile.final" with lines title "Somethings" lw 3  linecolor rgb "#29CC6A"
  </code></pre>
  
  <p>i have this error :</p>
  
  <pre><code>plot "../myFile.final" with lines title "Somethings" lw 3  linecolor rgb "#29CC6A"
                                                                                                ^
  "local.gnuplot", line 16: all points y value undefined
  </code></pre>
  
  <p>I have juste one column ! it represente <code>yrange</code>. <code>xrange</code> is represented by number of line ! example of my datapoint :</p>
  
  <pre><code>125456
  130000
  150000
  </code></pre>
  
  <p>first point of x is 1, second point of x is 2, and last is 3. now i want to represente this 1, 2, 3 by a scale 50, 55, 60 ! </p>