bar plot with color bar

Question

H.Zheng 2021-1-15

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/717690-bar-plot-with-color-bar

评论： Mathieu NOE 2021-1-18

I have x rows and three columns: Region, CO2, and GDP. I want to make a bar plot like below, using CO2 as x axis and Region as y axis, meanwhile, using the value of GDP to fill each bar and also add a color bar. I tried different ways, but I could not figure it out. Anyone could help me? Many thanks~

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Answer 1

Mathieu NOE 2021-1-15

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/717690-bar-plot-with-color-bar#answer_598650

在 MATLAB Online 中打开

hello

see code example below

all the best

clc
clear all
close all
data = [.142 .156 .191 .251 0.5 0.86 2.2 4 8.3];
uniNames = {'eno','pck','zwf','foo','bar','jhy','vfd','vre','zqs'};
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% main code %%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
data_min = min(data);
data_max = max(data);
map = colormap('jet');
[mmap,nmap] = size(map);
f = figure(1);
fig_pos = [681   105   683   874];
set(f,'Position',fig_pos);
N = numel(data);
for i=1:N
  h = barh(N-i+1, data(i));
  if i == 1, hold on, end
  % now define col value based on data value (min data value maps to colormap map index 1
  % and max data value maps to colormap map last index);
  ind = fix(1+(mmap-1)*(data(i)-data_min)/(data_max-data_min));
  set(h, 'FaceColor', map(ind,:)) ;
  % Display the values as labels at the tips of the  bars. 
    xtips1 = h.YEndPoints + 0.1;
    ytips1 = h.XEndPoints;
    labels1 = string(h.YData);
    text(xtips1,ytips1,labels1,'VerticalAlignment','middle')
end
% 
set(gca, 'YTickLabel', '')  
ylabetxt = uniNames;
xpos = -max(ylim)/12;
text(repmat(xpos,N,1),1:N, ylabetxt','Rotation',0,'FontSize',15);
xlabel('CO² concentration','FontSize',12)
hcb=colorbar('hor');
hcb.Title.String = "A colorbar title";
% hcb.Title.HorizontalAlignment = "center";
hcb.Title.FontSize = 15;
hcb.Title.Position = [210  -40  0];

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Mathieu NOE 2021-1-15

在 MATLAB Online 中打开

hum - improved version with Co² and GDP data , so that color is mapped to GDP and bar length is mapped with C0²

data_co2 = [.142 .156 .191 .251 0.5 0.86 2.2 4 8.3];
data_gdp = rand(size(data_co2));
uniNames = {'eno','pck','zwf','foo','bar','jhy','vfd','vre','zqs'};
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%% main code %%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
data_min = min(data_gdp);
data_max = max(data_gdp);
map = colormap('jet');
[mmap,nmap] = size(map);
f = figure(1);
fig_pos = [681   105   683   874];
set(f,'Position',fig_pos);
N = numel(data_co2);
for i=1:N
  h = barh(N-i+1, data_co2(i));
  if i == 1, hold on, end
  % now define col value based on data value (min data value maps to colormap map index 1
  % and max data value maps to colormap map last index);
  ind = fix(1+(mmap-1)*(data_gdp(i)-data_min)/(data_max-data_min));
  set(h, 'FaceColor', map(ind,:)) ;
  % Display the values as labels at the tips of the  bars. 
    xtips1 = h.YEndPoints + 0.1;
    ytips1 = h.XEndPoints;
    labels1 = string(h.YData);
    text(xtips1,ytips1,labels1,'VerticalAlignment','middle')
end
% 
set(gca, 'YTickLabel', '')  
ylabetxt = uniNames;
xpos = -max(ylim)/12;
text(repmat(xpos,N,1),1:N, ylabetxt','Rotation',0,'FontSize',15);
xlabel('CO² concentration','FontSize',12)
hcb=colorbar('hor');
hcb.Title.String = "GDP range";
% hcb.Title.HorizontalAlignment = "center";
hcb.Title.FontSize = 15;
hcb.Title.Position = [210  -40  0];