Make the size of a heatmap bigger with seaborn

Question

I create a heatmap  with seaborn   df1 index   pd to datetime df1 index  df1   df1 set index  TIMESTAMP   df1   df1 resample  30min   mean   ax   sns heatmap df1 iloc    1 6    annot True  linewidths  5    But the probleme is when there is lot of data in the dataframe the heatmap will be too small and the value inside begin not clear like in the attached image   How can I change the size of the heatmap to be more bigger   Thank you  EDIT  I try     df1 index   pd to datetime df1 index  fig  ax   plt subplots figsize  10 10             Sample figsize in inches sns heatmap df1 iloc    1 6    annot True  linewidths  5  ax ax  df1   df1 set index  TIMESTAMP   df1   df1 resample  1d   mean   ax   sns heatmap df1 iloc    1 6    annot True  linewidths  5    But I get this error     KeyError                                  Traceback  most recent call last  C  Users Demonstrator Anaconda3 lib site-packages pandas indexes base py in get loc self  key  method  tolerance     1944             try  - gt  1945                 return self  engine get loc key     1946             except KeyError   pandas index pyx in pandas index IndexEngine get loc  pandas index c 4154     pandas index pyx in pandas index IndexEngine get loc  pandas index c 4018     pandas hashtable pyx in pandas hashtable PyObjectHashTable get item  pandas hashtable c 12368     pandas hashtable pyx in pandas hashtable PyObjectHashTable get item  pandas hashtable c 12322     KeyError   TIMESTAMP   During handling of the above exception  another exception occurred   KeyError                                  Traceback  most recent call last   lt ipython-input-779-acaf05718dd8 gt  in  lt module gt          2 fig  ax   plt subplots figsize  10 10             Sample figsize in inches       3 sns heatmap df1 iloc    1 6    annot True  linewidths  5  ax ax  ---- gt  4 df1   df1 set index  TIMESTAMP         5 df1   df1 resample  1d   mean         6 ax   sns heatmap df1 iloc    1 6    annot True  linewidths  5   C  Users Demonstrator Anaconda3 lib site-packages pandas core frame py in set index self  keys  drop  append  inplace  verify integrity     2835                 names append None     2836             else  - gt  2837                 level   frame col   values    2838                 names append col     2839                 if drop   C  Users Demonstrator Anaconda3 lib site-packages pandas core frame py in   getitem   self  key     1995             return self  getitem multilevel key     1996         else  - gt  1997             return self  getitem column key     1998     1999     def  getitem column self  key    C  Users Demonstrator Anaconda3 lib site-packages pandas core frame py in  getitem column self  key     2002           get column    2003         if self columns is unique  - gt  2004             return self  get item cache key     2005     2006           duplicate columns  amp  possible reduce dimensionality  C  Users Demonstrator Anaconda3 lib site-packages pandas core generic py in  get item cache self  item     1348         res   cache get item     1349         if res is None  - gt  1350             values   self  data get item     1351             res   self  box item values item  values     1352             cache item    res  C  Users Demonstrator Anaconda3 lib site-packages pandas core internals py in get self  item  fastpath     3288     3289             if not isnull item   - gt  3290                 loc   self items get loc item     3291             else     3292                 indexer   np arange len self items   isnull self items    C  Users Demonstrator Anaconda3 lib site-packages pandas indexes base py in get loc self  key  method  tolerance     1945                 return self  engine get loc key     1946             except KeyError  - gt  1947                 return self  engine get loc self  maybe cast indexer key      1948     1949         indexer   self get indexer  key   method method  tolerance tolerance   pandas index pyx in pandas index IndexEngine get loc  pandas index c 4154     pandas index pyx in pandas index IndexEngine get loc  pandas index c 4018     pandas hashtable pyx in pandas hashtable PyObjectHashTable get item  pandas hashtable c 12368     pandas hashtable pyx in pandas hashtable PyObjectHashTable get item  pandas hashtable c 12322     KeyError   TIMESTAMP    EDIT  TypeError                                 Traceback  most recent call last   lt ipython-input-890-86bff697504a gt  in  lt module gt          2 df2 resample  30min   mean         3 fig  ax   plt subplots   ---- gt  4 ax   sns heatmap df2 iloc    1 6    annot True  linewidths  5        5 ax set yticklabels  i strftime   Y- m- d  H  M  S   for i in df2 index   rotation 0   C  Users Demonstrator Anaconda3 lib site-packages seaborn matrix py in heatmap data  vmin  vmax  cmap  center  robust  annot  fmt  annot kws  linewidths  linecolor  cbar  cbar kws  cbar ax  square  ax  xticklabels  yticklabels  mask    kwargs      483     plotter    HeatMapper data  vmin  vmax  cmap  center  robust  annot  fmt      484                           annot kws  cbar  cbar kws  xticklabels  -- gt  485                           yticklabels  mask      486      487       Add the pcolormesh kwargs here  C  Users Demonstrator Anaconda3 lib site-packages seaborn matrix py in   init   self  data  vmin  vmax  cmap  center  robust  annot  fmt  annot kws  cbar  cbar kws  xticklabels  yticklabels  mask      165           Determine good default values for the colormapping     166         self  determine cmap params plot data  vmin  vmax  -- gt  167                                     cmap  center  robust      168      169           Sort out the annotations  C  Users Demonstrator Anaconda3 lib site-packages seaborn matrix py in  determine cmap params self  plot data  vmin  vmax  cmap  center  robust      202                                cmap  center  robust       203            Use some heuristics to set good defaults for colorbar and range     -- gt  204         calc data   plot data data  np isnan plot data data       205         if vmin is None      206             vmin   np percentile calc data  2  if robust else calc data min    TypeError  ufunc  isnan  not supported for the input types  and the inputs could not be safely coerced to any supported types according to the casting rule   safe

User · Answer

add plt figure figsize  16 5   before the sns heatmap and play around with the figsize numbers till you get the desired size       plt figure figsize    16 5    ax   sns heatmap df1 iloc    1 6    annot True  linewidths  5

User · Answer

You could alter the figsize by passing a tuple showing the width  height parameters you would like to keep    import matplotlib pyplot as plt  fig  ax   plt subplots figsize  10 10             Sample figsize in inches sns heatmap df1 iloc    1 6    annot True  linewidths  5  ax ax    EDIT  I remember answering a similar question of yours where you had to set the index as TIMESTAMP  So  you could then do something like below   df   df set index  TIMESTAMP   df resample  30min   mean   fig  ax   plt subplots   ax   sns heatmap df iloc    1 6    annot True  linewidths  5  ax set yticklabels  i strftime   Y- m- d  H  M  S   for i in df index   rotation 0    For the head of the dataframe you posted  the plot would look like

User · Answer

I do not know how to solve this using code  but I do manually adjust the control panel at the right bottom in the plot figure  and adjust the figure size like  f  ax   plt subplots figsize  16  12    at the meantime until you get a matched size colobar  This worked for me

[python] Make the size of a heatmap bigger with seaborn

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