title: Plotting the means on a plot in matplotlib
body: <p>I have a dataset consisting of multiple temperature profiles and I want to create a mean temperature profile. In order to do this I figured that if I could calculate the mean at each depth, I could then simply plot the mean temperature at each depth on a plot.</p>
  
  <p>I know that in order to calculate the mean temperature at a depth, I could use:</p>
  
  <pre><code>    import numpy as np
      import datetime as dt
      import matplotlib.pyplot as plt
      #read in data here
      temper2out = []
  
      temperature2m = np.mean(temperature[depth==2])
      temper2out.extend(list(temperature2m)
  
      T2out = np.array(temper2out)
      t2 = np.mean(T2out)
      tout.extend(list(t2)) #I could then do this for every depth, but since it goes to 150m, that would be lengthy.
      Tout = np.array(tout) 
  </code></pre>
  
  <p>I know that this could get me some results, but it is a long-winded way to do this. I also wouldn't really know how to plot this. So my question is, is there a better way to go around this task? And if so, how? I'm sorry to ask so much, I'm very new to Python!</p>
  
  <p>The data is in this format (sorry I don't know how to get a pastebin): </p>
  
  <pre><code>TagID    ProfileNo   ProfileDirn     DateTime    Lat     Lon     Depth   Temperature
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 2   5.04
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 3   5.0382
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 4   5.0262
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 5   5.0105
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 6   4.993
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 7   4.9866
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 8   4.9709
  pv42-156-12 1    A   25/01/2012 00:00   52.90618    0.36051 9   4.97
  pv42-156-12 2    A   25/01/2012 00:00   52.90493    0.35768 2   4.98
  pv42-156-12 2    A   25/01/2012 00:00   52.90493    0.35768 3   4.9783
  pv42-156-12 2    A   25/01/2012 00:00   52.90493    0.35768 4   4.9739
  pv42-156-12 2    A   25/01/2012 00:00   52.90493    0.35768 5   4.9733
  pv42-156-12 2    A   25/01/2012 00:00   52.90493    0.35768 6   4.9733
  pv42-156-12 2    A   25/01/2012 00:00   52.90493    0.35768 7   4.9717
  pv42-156-12 2    A   25/01/2012 00:00   52.90493    0.35768 8   4.97
  pv42-156-12 3    A   25/01/2012 00:00   52.89433    0.35407 2   5.05
  pv42-156-12 3    A   25/01/2012 00:00   52.89433    0.35407 3   5.05
  pv42-156-12 3    A   25/01/2012 00:00   52.89433    0.35407 6   5.05
  pv42-156-12 3    A   25/01/2012 00:00   52.89433    0.35407 7   5.05
  pv42-156-12 3    A   25/01/2012 00:00   52.89433    0.35407 8   5.05
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 2   5.17
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 3   5.1521
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 4   5.1423
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 5   5.1274
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 6   5.1075
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 7   5.1056
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 8   5.0828
  pv42-156-12 4    A   25/01/2012 00:00   52.89037    0.35476 9   5.05
  pv42-156-12 5    A   25/01/2012 00:00   52.88979    0.35553 2   5.36
  pv42-156-12 5    A   25/01/2012 00:00   52.88979    0.35553 3   5.3392
  pv42-156-12 5    A   25/01/2012 00:00   52.88979    0.35553 4   5.3263
  pv42-156-12 5    A   25/01/2012 00:00   52.88979    0.35553 5   5.2937
  pv42-156-12 5    A   25/01/2012 00:00   52.88979    0.35553 6   5.2828
  pv42-156-12 5    A   25/01/2012 00:00   52.88979    0.35553 7   5.2729
  pv42-156-12 5    A   25/01/2012 00:00   52.88979    0.35553 9   5.26
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 2   5.15
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 3   5.147
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 4   5.142
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 5   5.103
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 6   5.065
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 7   5.053
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 8   5.043
  pv42-156-12 6    A   25/01/2012 00:00   52.88875    0.35713 9   5.04
  pv42-156-12 7    A   25/01/2012 00:00   52.88661    0.35636 2   5.31
  pv42-156-12 7    A   25/01/2012 00:00   52.88661    0.35636 3   5.32
  pv42-156-12 7    A   25/01/2012 00:00   52.88661    0.35636 4   5.3229
  pv42-156-12 7    A   25/01/2012 00:00   52.88661    0.35636 5   5.3243
  pv42-156-12 7    A   25/01/2012 00:00   52.88661    0.35636 6   5.33
  pv42-156-12 7    A   25/01/2012 00:00   52.88661    0.35636 8   5.33
  pv42-156-12 8    A   25/01/2012 00:00   52.88602    0.35538 2   5.282
  pv42-156-12 8    A   25/01/2012 00:00   52.88602    0.35538 3   5.28
  pv42-156-12 8    A   25/01/2012 00:00   52.88602    0.35538 5   5.28
  pv42-156-12 8    A   25/01/2012 00:00   52.88602    0.35538 6   5.284
  pv42-156-12 8    A   25/01/2012 00:00   52.88602    0.35538 7   5.284
  pv42-156-12 8    A   25/01/2012 00:00   52.88602    0.35538 8   5.29
  pv42-156-12 9    A   25/01/2012 00:00   52.88558    0.35458 2   5.26
  pv42-156-12 9    A   25/01/2012 00:00   52.88558    0.35458 3   5.2627
  pv42-156-12 9    A   25/01/2012 00:00   52.88558    0.35458 4   5.2709
  pv42-156-12 9    A   25/01/2012 00:00   52.88558    0.35458 5   5.2755
  pv42-156-12 9    A   25/01/2012 00:00   52.88558    0.35458 6   5.2791
  pv42-156-12 9    A   25/01/2012 00:00   52.88558    0.35458 7   5.28
  pv42-156-12 9    A   25/01/2012 00:00   52.88558    0.35458 8   5.28
  pv42-156-12 10   A   25/01/2012 00:00   52.88433    0.35418 2   5.26
  pv42-156-12 10   A   25/01/2012 00:00   52.88433    0.35418 3   5.2648
  pv42-156-12 10   A   25/01/2012 00:00   52.88433    0.35418 4   5.2648
  pv42-156-12 10   A   25/01/2012 00:00   52.88433    0.35418 5   5.2705
  pv42-156-12 10   A   25/01/2012 00:00   52.88433    0.35418 6   5.2743
  pv42-156-12 10   A   25/01/2012 00:00   52.88433    0.35418 7   5.2752
  pv42-156-12 10   A   25/01/2012 00:00   52.88433    0.35418 8   5.28
  </code></pre>