title: Gnuplot error in ploting histogram with xdate
body: <p>I'm trying to plot a histogram with the xtics as time information. The gp script I'm using is this one:</p>
  
  <pre><code>set style data histogram
  set style histogram cluster gap 1
  set boxwidth 1
  
  set datafile separator "\t"
  set yrange[0:3000]
  set xlabel "xaxis"
  set ylabel "yaxis"
  set xdata time
  set timefmt "%Y-%m-%d %H"
  
  
  set terminal png size 1200,800
  set output outputfile
  plot inputfile u 2:1 title "Count"
  </code></pre>
  
  <p>An example of my inputfile(that I pass by parameter) is this one:</p>
  
  <pre><code>2012-07-22 00:00:00    159.361111111
  2012-07-22 01:00:00    207.019166667
  2012-07-22 02:00:00    191.749722222
  2012-07-22 03:00:00    147.647777778
  2012-07-22 04:00:00    107.751388889
  2012-07-22 05:00:00    95.9566666667
  2012-07-22 06:00:00    110.405277778
  2012-07-22 07:00:00    151.689166667
  2012-07-22 08:00:00    244.787777778
  2012-07-22 09:00:00    481.601388889
  </code></pre>
  
  <p>However I'm receiving the error "plot_timeflow.gp", line 16: Too many columns in using specification and when I try to set the plot command to plot inputfile u 2:xticlabels(1) title "Count" I have the following error: "plot_timeflow.gp", line 16: Need full using spec for x time data.</p>
  
  <p>Does someone have any ideia, what is the problem??</p>
  
  <p>Thanks in advance.</p>