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seaborn heatmap color scheme based on row values

I have a dataframe, reproduced partly as such:

import pandas as pd
import numpy as np
tab = pd.DataFrame(np.array([[ 46,  39,  25,  29,  21,  12,  33,  32,  70, 109, 144, 158, 161,
    184, 163, 113, 117,  82,  76,  88,  77,  76,  64,  35],
   [ 39,  33,  29,  29,  26,  14,  25,  33,  60,  83, 126, 117, 111,
    148, 141, 104,  92,  75,  78,  74,  63,  67,  52,  39],
   [ 30,  27,  14,  11,  20,  17,  21,  31,  48,  62,  83,  78,  88,
     90,  80,  67,  53,  61,  47,  54,  50,  48,  35,  26],
   [ 30,  24,  19,  15,  17,  10,  12,  18,  34,  69,  88,  79, 109,
     95,  89,  82,  53,  46,  53,  57,  39,  41,  26,  29],
   [ 37,  31,  18,  12,  30,  13,  15,  19,  51,  61,  74,  81,  77,
    100,  96,  74,  60,  57,  42,  48,  43,  40,  29,  25],
   [ 14,   8,  14,  11,  13,   7,   9,  15,  42,  49,  50,  44,  53,
     42,  31,  31,  30,  27,  33,  25,  27,  17,  20,  17],
   [ 10,  15,   6,  10,  15,  11,   7,  18,  28,  43,  49,  37,  41,
     33,  37,  32,  26,  28,  19,  24,  19,  19,  13,  18],
   [  9,   9,   8,  12,   7,  11,   4,   8,  14,  15,  23,  30,  29,
     34,  25,  39,  22,  20,  15,  23,  12,  19,  14,  13],
   [  0,   3,   4,   1,   1,   0,   3,   4,   4,   5,   3,   5,   6,
      7,   3,   3,   6,   4,   2,   3,   3,   2,   2,   2],
   [  3,   0,   1,   0,   0,   0,   1,   1,   4,   8,   2,   4,   7,
      2,   2,   9,   3,   5,   1,   5,   2,   0,   4,   1]]), index = 
        ['Stadsdeel Zuid', 'Stadsdeel West', 'Stadsdeel Nieuw-West',
   'Stadsdeel Centrum', 'Stadsdeel Oost', 'Stadsdeel Noord',
   'Wijk 00 Amstelveen', 'Stadsdeel Zuidoost', 'Wijk 00',
   'Wijk 00 Aalsmeer'])

and I created a heatmap as such

ax = sns.heatmap(tab, linewidths=.5 ,robust=True ,annot_kws = {'size':14})
ax.tick_params(labelsize=14)
ax.figure.set_size_inches((12, 10))

I would like though that values to anchor the colormap are based on min-max values per row so that also rows with lower values are well visible. (in reality the table contains many more rows with low values that the heatmap barely shows color-wise)

How to achieve this ?

enter image description here

like image 460
ad_s Avatar asked Feb 08 '17 10:02

ad_s


1 Answers

I would normalize the tab rows by the maximum value in each row with:

tab_n = tab.div(tab.max(axis=1), axis=0)

where tab_n is the normalized tab having values in the range [0,1]. Hope that helps. Plotting tab_n should return an heatmap like this:

enter image description here

like image 167
Fabio Lamanna Avatar answered Oct 16 '22 03:10

Fabio Lamanna