title: Matplotlib string xticks
body: <pre><code>def plot_freq_error(diff,file,possible_frequency):
      for foo in range(0, len(diff)):
          x = [diff[foo]]
          name = comp
          color = ['0.1', '0.2', '0.3','0.4','0.5','0.6','0.7','0.8', '0.9','0.95','1.0']
          label = ['0.8GHz','1.0GHz','1.2GHz','1.4GHz','1.6GHz','1.8GHz','2.0GHz','2.2GHz','2.4GHz']
          y = zip(*x)
          pos = np.arange(len(x))
          width = 1. / (1 + len(x))
  
          fig,ax = plt.subplots()
          matplotlib.rcParams.update({'font.size': 22})
          for idx, (serie, color,label) in enumerate(zip(y, color,label)):
              ax.bar(pos + idx * width, serie, width, color=color,label=label)
  
          plt.tick_params(\
              axis='x',          # changes apply to the x-axis
              which='both',      # both major and minor ticks are affected
              bottom='off',      # ticks along the bottom edge are off
              top='off',         # ticks along the top edge are off
              labelbottom='off') # labels along the bottom edge are off
          plt.tick_params(axis='both', which='major', labelsize=10)
          plt.tick_params(axis='both', which='minor', labelsize=8)
          plt.ylabel(name[foo],fontsize=40)
          #ax.legend(prop={'size':5})
          plt.xticks(label)
          plt.gray()
          plt.show()
          plt.clf()
  </code></pre>
  
  <p>With the code I wrote above I am unable to plot the <code>xticks</code> as string/floating point value for each bar. what am I doing wrong?</p>