Multi Colors and Legend for each bar

Question

AZ Sajjad 2022-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/1774800-multi-colors-and-legend-for-each-bar

编辑： Adam Danz 2022-11-13

采纳的回答： dpb

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How do I set Multi Colors and Legend for each bar? Here I have given below my code

clc;

close all;

clear;

y = [467000, 150777, 20915, 229073, 95844];
figure;
bar(y);
set(gca,'XTickLabel',{'DG', 'PV', 'Converter', 'Battery', 'Flywheel'})
xlabel ('Components','fontweight','bold','FontSize',15)
ylabel ('Net Present Cost($)','fontweight','bold','FontSize',15)
grid on

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Answer 1

dpb 2022-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/1774800-multi-colors-and-legend-for-each-bar#answer_1021895

编辑：dpb 2022-8-9

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Slightly different, using a colorbar is nice alternative; legend is somewhat problematical owing to design of bar in that it's only a single object with one vector --

y = [467000, 150777, 20915, 229073, 95844];

x=categorical({'DG', 'PV', 'Converter', 'Battery', 'Flywheel'}); % turn x into categorical variable

figure;

hB=bar(x,y,'FaceColor','flat');

C=colororder; % retrieve default colororder vector

hB.CData=C(1:numel(y),:); % use first N

grid on

ylabel ('Net Present Cost($)','fontweight','bold','FontSize',15)

hAx=gca; % get current axes handle

hAx.YAxis.TickLabelFormat='%0.1f'; % fix up the funky numeric display

% now add a legend by faking another plot that will create the handles...

hold on

hA=area(x,nan(numel(x))); % area will be patch

hLg=legend(hA,categories(x)); % legend it...

Again, that one has to resort to workarounds to do something that should be easily done by direct action with bar continues to illustrate how poor its UI/internal design is. While such games are sometimes entertaining and intriguing to see how clever one can get, It's not productive time spent and detracts from accomplishing the real job at hand in timely manner.

The above produces(*)

(*) Sans the y axis cleanup that's not in the copy I saved/attached...

ADDENDUM:

For releases of MATLAB prior to incorporation of categorical variables on x-axis (not sure precisely when)...

figure

components={'DG', 'PV', 'Converter', 'Battery', 'Flywheel'};

y = [467000, 150777, 20915, 229073, 95844];

hB=bar(y,'FaceColor','flat');

xticklabels(components)

C=colororder; % retrieve default colororder vector

hB.CData=C(1:numel(y),:); % use first N

grid on

ylabel ('Net Present Cost($)','fontweight','bold','FontSize',15)

hAx=gca; % get current axes handle

hAx.YAxis.TickLabelFormat='%0.1f'; % fix up the funky numeric display

% now add a legend by faking another plot that will create the handles...

hold on

hA=area(nan(numel(components))); % area will be patch

set(hA,{'FaceColor'},mat2cell(hB.CData,[ones(size(y))],[3])) % set areas to match bar face colors

hLg=legend(hA,components); % legend it...

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AZ Sajjad 2022-8-9

Sir,

I used MATLAB 2022a and got the following graph by running the code you gave.

But sir, there is a difference between bar color and legend color. So sir, if you kindly solve it again, it will benefit me. Here I have given below your code.

clc;

close all;

clear;

figure

components={'DG', 'PV', 'Converter', 'Battery', 'Flywheel'};

y = [467000, 150777, 20915, 229073, 95844];

hB=bar(y,'FaceColor','flat');

xticklabels(components)

C=colororder; % retrieve default colororder vector

hB.CData=C(1:numel(y),:); % use first N

grid on

ylabel ('Net Present Cost($)','fontweight','bold','FontSize',15)

hAx=gca; % get current axes handle

hAx.YAxis.TickLabelFormat='%0.1f'; % fix up the funky numeric display

% now add a legend by faking another plot that will create the handles...

hold on

hA=area(nan(numel(components))); % area will be patch

hLg=legend(hA,components);

AZ Sajjad 2022-10-22

A lot of thanks, sir, for giving your precious time.

and

I'm also sorry for selecting the Accepted Answer lately.

dpb 2022-10-22

No problem, glad to help...and thank you for coming back, belatedly or not... :)

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Answer 2

Adam Danz 2022-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/1774800-multi-colors-and-legend-for-each-bar#answer_1021855

编辑：Adam Danz 2022-11-13

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Colorbar option

This is based on the solution from this thread.

barData = rand(1,5);

figure();

bh = bar(barData);

% set bar color

bh.FaceColor = 'flat';

bh.CData = jet(numel(barData)); % use any colormap you'd like

% Add colorbar with categorical color labels

colormap(bh.CData)

cb = colorbar();

caxis([0,numel(barData)])

cb.YTick = 0.5 : 1 : numel(barData);

cb.TickLabels = {'Plovdiv','Varna','Burgas','Ruse','Haskovo'};

cb.TickLabelInterpreter = 'none';

cb.FontSize = 8;

bh.Parent.Position(3) = 0.55; % make the axis narrower to fit the colorbar labels.

Legend option

You can create each bar separately and specify its x-values.

% barData = rand(1,5)

colors = jet(numel(barData));

names = {'Plovdiv','Varna','Burgas','Ruse','Haskovo'};

fig = figure();

ax = axes(fig);

hold(ax,'on')

h = gobjects(size(barData));

for i = 1:numel(barData)

h(i) = bar(ax, i, barData(i), ...

'FaceColor', colors(i,:), ...

'DisplayName', names{i});

end

legend(h,'location','bestoutside')

xlim(ax, [0.25, numel(barData)+0.75])

box(ax,'on')

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dpb 2022-8-7

编辑：dpb 2022-8-7

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@Adam Danz, if you're going to build the separate bars to create the handles anyway, why don't you just forego the first and build them to begin with?

figure
hB=gobjects(numel(barData),1);
dumData=nan(size(barData));         % a place holder won't display
x=1:numel(barData);                 % x values to draw full-sized bar
for i = 1:numel(barData)
  dumData(i)=barData(i);    % the fixup show only one bar at time
  hB(i)=bar(x, dumData,'FaceColor',bh.CData(i,:));   % now can specify 'FaceColor'
  if i==1, hold on, end     % hold on first doesn't set overall x limits
  dumData(i)=nan;           % put the NaN back for next iteration
end
legend(TickLabels,'Location','northwest')

produces

This way, you can get the default color order automagically by simply leaving out the 'FaceColor' parameter or use the named color abbreviations or whatever choose...

This adds some complexity to build the dummy data array at the slight advantage of being able to set 'FaceColor' instead of futzing with the internal CData array or the one-handle object. It's that extra effort that made me use the area subterfuge to get a set of handles drawn with patches that could do in "one swell foop" instead.

I STILL say any/all of these machinations are reflections on the ill-chosen design and UI for bar() itself that should directly addressable properties for every bar, property fields for applying labels, the values and so on directly.

Adam Danz 2022-8-7

编辑：Adam Danz 2022-8-7

在 MATLAB Online 中打开

You don't even need the padding. I'll update my answer since this is better than my second option.

y = [2 4 3 5 2]; % bar heights

colors = lines(numel(y));

names = {'Plovdiv','Varna','Burgas','Ruse','Haskovo'};

fig = figure();

ax = axes(fig);

hold(ax,'on')

h = gobjects(size(y));

for i = 1:numel(y)

h(i) = bar(ax, i, y(i), ...

'FaceColor', colors(i,:), ...

'DisplayName', names{i});

end

legend(h,'location','bestoutside')

xlim(ax, [0.25, numel(y)+0.75])

dpb 2022-8-7

编辑：dpb 2022-8-7

在 MATLAB Online 中打开

"You don't even need the padding."

But then you must manually fix up the axes limits as

xlim(ax, [0.25, numel(y)+0.75])

which IMO is more problematical to get right. That's the reason hold on wasn't done first as well plus using the x vector expicitly--when you only plot the one by itself, then you get ticks and xlimits that don't match those from bar() for the same number of bars done natively.

It's a mess...there's no really good solution given the limitations of the internals design.

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Multi Colors and Legend for each bar

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Multi Colors and Legend for each bar

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