title: Plotly deactivate x axis sorting
body: <p>I want to plot a bar chart. On the x-axis are IDs of consultants. They range between 1000 and 2000. Each consultant has a specific number of customers (y-axis). </p>
  
  <p>Now I want to plot a bar chart in plotly. But plotly orders the consultant IDs ascending and interprets them as integer, but they are not. They shall be ordered like the list I give plotly.</p>
  
  <p>By the way in matplotlib the order is right.</p>
  
  <pre><code>trace1 = go.Bar(
      x=consultants, 
      y=info[0,:]
  )
  trace2 = go.Bar(
      x=consultants,
      y=info[1,:],
  )
  trace3 = go.Bar(
      x=consultants,
      y=info[2,:]
  )
  trace4 = go.Bar(
     x=consultants,
     y=info[3,:]
  )
  
  data = [trace1, trace2, trace3, trace4]
  layout = go.Layout(
         barmode='stack',
         xaxis=dict(
         categoryorder='array',
         categoryarray=consultants,
         titlefont=dict(
           size=18,
           color='black'),
         showticklabels=True,
         tickfont=dict(
          size=16,
          color='black',
          ),
      tickangle=20
      ),
  yaxis=dict(
      title='Number of customers',
         titlefont=dict(
          size=18,
          color='black'),
      showgrid=True,
      showline=False,
      showticklabels=True,
      tickfont=dict(
          size=16,
          color='black')
      ),
  
    )
  
  fig = go.Figure(data=data, layout=layout)
  py.iplot(fig, filename='stacked-bar')
  </code></pre>