How to modify the colorbar font and size when drawing with the heatmap function？

When using the heatmap function to draw, the font and size of colorbar cannot be modified.

clear;clc;close all

M = [0.9284,0.4765,0.2391,0.2548,0.2648;

0.2575,0.8214,0.8071,0.2356,0.2339;

0.2331,0.2307,0.9944,0.5106,0.2217;

0.2449,0.2102,0.2005,0.6086,0.2167;

0.2738,0.2263,0.2052,0.2279,0.5993];

xLabels = {'20','50','100','150','200'};

yLabels = {'10','20','30','40','50'};

h = heatmap(M,'XDisplayLabels',xLabels,'YDisplayLabels',yLabels);

title('RMSE Heatmap');

xlabel('True');

ylabel('Model');fw=12;h.FontSize=fw;

colormap(h, 'parula');

set(gca,'FontName','Times New Roman','FontSize',fw);

Answer 1

[Umar]

Hi @Wei,

To address and interpret your comments correctly, “When using the heatmap function to draw, the font and size of colorbar cannot be modified.” & going through documentation provided below,

https://www.mathworks.com/help/bioinfo/ref/heatmap.html

I implemented code which demonstrates how to set the font size for the heatmap itself and the axes, but the colorbar remains unaffected by these settings.

   % Define the matrix for the heatmap
   M = [0.9284, 0.4765, 0.2391, 0.2548, 0.2648;
     0.2575, 0.8214, 0.8071, 0.2356, 0.2339;
     0.2331, 0.2307, 0.9944, 0.5106, 0.2217;
     0.2449, 0.2102, 0.2005, 0.6086, 0.2167;
     0.2738, 0.2263, 0.2052, 0.2279, 0.5993]; 

   % Define the labels for the axes
   xLabels = {'20', '50', '100', '150', '200'}; 
   yLabels = {'10', '20', '30', '40', '50'}; 

     % Create the heatmap
     h = heatmap(M, 'XDisplayLabels', xLabels, 'YDisplayLabels', yLabels); 
     title('RMSE Heatmap');
     xlabel('True');
     ylabel('Model');

   % Set font size for the heatmap
   fw = 12; 
   h.FontSize = fw;

   % Set the colormap
   colormap(h, 'parula');

   % Customize the axes font properties
   set(gca, 'FontName', 'Times New Roman', 'FontSize', fw);

Please see attached.

Hope this helps.