Moving x-axis to the top of a plot in matplotlib

Question

Based on this question about heatmaps in matplotlib  I wanted to move the x-axis titles to the top of the plot   import matplotlib pyplot as plt import numpy as np column labels   list  ABCD   row labels   list  WXYZ   data   np random rand 4 4  fig  ax   plt subplots   heatmap   ax pcolor data  cmap plt cm Blues     put the major ticks at the middle of each cell ax set xticks np arange data shape 0   0 5  minor False  ax set yticks np arange data shape 1   0 5  minor False     want a more natural  table-like display ax invert yaxis   ax xaxis set label position  top      lt -- This doesn t work   ax set xticklabels row labels  minor False  ax set yticklabels column labels  minor False  plt show     However  calling matplotlib s set label position  as notated above  doesn t seem to have the desired effect  Here s my output     What am I doing wrong

User · Answer

tick params is very useful for setting tick properties  Labels can be moved to the top with       ax tick params labelbottom False labeltop True

User · Answer

You want set ticks position rather than set label position   ax xaxis set ticks position  top     the rest is the same   This gives me

User · Answer

Use  ax xaxis tick top     to place the tick marks at the top of the image  The command  ax set xlabel  X LABEL       ax xaxis set label position  top      affects the label  not the tick marks   import matplotlib pyplot as plt import numpy as np column labels   list  ABCD   row labels   list  WXYZ   data   np random rand 4  4  fig  ax   plt subplots   heatmap   ax pcolor data  cmap plt cm Blues     put the major ticks at the middle of each cell ax set xticks np arange data shape 1     0 5  minor False  ax set yticks np arange data shape 0     0 5  minor False     want a more natural  table-like display ax invert yaxis   ax xaxis tick top    ax set xticklabels column labels  minor False  ax set yticklabels row labels  minor False  plt show

User · Answer

You ve got to do some extra massaging if you want the ticks  not labels  to show up on the top and bottom  not just the top   The only way I could do this is with a minor change to unutbu s code   import matplotlib pyplot as plt import numpy as np column labels   list  ABCD   row labels   list  WXYZ   data   np random rand 4  4  fig  ax   plt subplots   heatmap   ax pcolor data  cmap plt cm Blues     put the major ticks at the middle of each cell ax set xticks np arange data shape 1     0 5  minor False  ax set yticks np arange data shape 0     0 5  minor False     want a more natural  table-like display ax invert yaxis   ax xaxis tick top   ax xaxis set ticks position  both     THIS IS THE ONLY CHANGE  ax set xticklabels column labels  minor False  ax set yticklabels row labels  minor False  plt show     Output

[python] Moving x-axis to the top of a plot in matplotlib

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