Multiple Colors in Bar Graph

I want a bar graph that creates 10 different bars. I want every bar to be different color. How do I achieve this?

Answer 1

[Mathieu NOE]

hello

see example below

clc
clear all
close all

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);

N = numel(data_co2);
for i=1:N
  h = bar(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.XEndPoints;
    ytips1 = h.YEndPoints + 0.25;
    labels1 = string(h.YData);
    text(xtips1,ytips1,labels1,'HorizontalAlignment','center')
end
% 
set(gca, 'XTickLabel', '')  
xlabetxt = uniNames;
xpos = -max(xlim)/25;
t = text(1:N,repmat(xpos,N,1), xlabetxt,'Rotation',45,'FontSize',15,'HorizontalAlignment','center');
ylabel('CO² concentration','FontSize',12)
title('CO² concentration vs. GDP range','FontSize',15)

hcb=colorbar('ver');
hcb.Title.String = "GDP range";
hcb.Title.FontSize = 13;

[Vartika Agarwal]

This code is not running properly

[Mathieu NOE]

hello

what matlab release are you running ?

can you tell what is the error message that appears in your command window ?

[Vartika Agarwal]

I am using Matlab 2018a

Error in bar (line 23)

h = bar(N-i+1, data_co2(i));

I want a bar graph that that creates 10 different bars. I want every bar to be different color.

y=[20 10 5 3 12 18 25 20 30 40];

bar(y)

[Mathieu NOE]

ok

can you check first that you actually have bar installed (should be as it's a basic graphical function)

let's try something simpler

y=[20 10 5 3 12 18 25 20 30 40];
N = length(y);
map = colormap(jet(N));

figure(1);
hold on
for i=1:N
  h = bar(i, y(i));
  set(h, 'FaceColor', map(i,:)) ;
end
hold off

[Vartika Agarwal]

Thanks Sir

It really works

[Mathieu NOE]

My pleasure !

would you mind accepting my answer ?

tx