Adding a y-axis label to secondary y-axis in matplotlib

Question

I can add a y label to the left y-axis using plt ylabel  but how can I add it to the secondary y-axis   table   sql read frame query connection   table 0  plot color colors 0  ylim  0 100   table 1  plot secondary y True color colors 1   plt ylabel

User · Accepted Answer

The best way is to interact with the axes object directly  import numpy as np import matplotlib pyplot as plt x   np arange 0  10  0 1  y1   0 05   x  2 y2   -1  y1  fig  ax1   plt subplots    ax2   ax1 twinx   ax1 plot x  y1   g-   ax2 plot x  y2   b-    ax1 set xlabel  X data   ax1 set ylabel  Y1 data   color  g   ax2 set ylabel  Y2 data   color  b    plt show

User · Answer

I don t have access to Python right now  but off the top of my head   fig   plt figure    axes1   fig add subplot 111    set props for left y-axis here  axes2   axes1 twinx       mirror them axes2 set ylabel

User · Answer

For everyone stumbling upon this post because pandas gets mentioned  you now have the very elegant and straighforward option of directly accessing the secondary y axis in pandas with ax right ax So paraphrasing the example initially posted  you would write  table   sql read frame query connection   ax   table  0  1   plot ylim  0 100   secondary y table 1   ax set ylabel      ax right ax set ylabel  Your second Y-Axis Label goes here      this is already mentioned in these posts as well  1 2

User · Answer

There is a straightforward solution without messing with matplotlib  just pandas   Tweaking the original example   table   sql read frame query connection   ax   table 0  plot color colors 0  ylim  0 100   ax2   table 1  plot secondary y True color colors 1   ax ax   ax set ylabel  Left axes label   ax2 set ylabel  Right axes label     Basically  when the secondary y True option is given  eventhough ax ax is passed too  pandas plot returns a different axes which we use to set the labels   I know this was answered long ago  but I think this approach worths it

[python] Adding a y-axis label to secondary y-axis in matplotlib

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