Legend in bar plot

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René Lampert
René Lampert 2021 年 7 月 3 日
回答済み: Greg LANGE 2022 年 10 月 19 日
Hello,
I wanna create a legend for a bar plot but I always get a warning message and it only shows one entitie of the legend. Here is a minimal code example
X=categorical({'small','medium','large'});
X=reordercats(X,{'small','medium','large'});
Y=[5 18 56];
TestL={'Mon','Tue','Wed'};
figure()
b=bar(X,Y);
b.FaceColor = 'flat';
b.CData(1,:)=[1 0 0];
b.CData(2,:)=[0 1 0];
b.CData(3,:)=[0 0 1];
legend(TestL)
And this is what i get from Matlab
What is wrong here ? I´m totally confused.
Thanks

採用された回答

dpb
dpb 2021 年 7 月 3 日
編集済み: dpb 2021 年 7 月 3 日
A somewhat different approach to Walter's to generate the three needed bar handles -- use a 'stacked' plot with the elements on the diagonal, zero for the off-diagonal elements. 'stacked' creates a bar for each row whose heights are each the sums of the elements on the row. (And, need 'stacked' because otherwise passing an array to bar causes it to draw a 'grouped' bar.)
hB=bar(X,diag(Y,0),'stacked');
hLg=legend(TestL,'Location','northwest');
with default color produces
The bars can be customized as desired through the array of bar handles hB.
  3 件のコメント
dpb
dpb 2021 年 7 月 3 日
set(hB,{'FaceColor'},{'r';'g';'b'})
hLg=legend(TestL,'Location','best')
will put where is least conflict with data -- if we do the above but swap the order to
hB=bar(flip(X),fliplr(diag(Y,0)),'stacked');
hLg=legend(TestL,'Location','best')
we get
where the legend has been moved automagically to the NE corner instead.
As an aside, I don't follow why this isn't the default legend behavior...
René Lampert
René Lampert 2021 年 7 月 4 日
thanks for your help

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その他の回答 (2 件)

Walter Roberson
Walter Roberson 2021 年 7 月 3 日
legend() creates at most one entry for each graphics object. However, each call to bar() creates one graphics object, not one object for each group.
Create one extra bar() object for each item you want to legend(), and use nan as the data for that. legend() on those handles
X=categorical({'small','medium','large'});
X=reordercats(X,{'small','medium','large'});
Y=[5 18 56];
TestL={'Mon','Tue','Wed'};
figure()
b=bar(X,Y);
hold on
b.FaceColor = 'flat';
b.CData(1,:)=[1 0 0];
b.CData(2,:)=[0 1 0];
b.CData(3,:)=[0 0 1];
bh(1) = bar(nan,nan,'r');
bh(2) = bar(nan,nan,'g');
bh(3) = bar(nan,nan,'b');
legend(bh, string(X))
  2 件のコメント
René Lampert
René Lampert 2021 年 7 月 3 日
thanks for your fast response...is it also possible to put the legend at another place, for instance at top left corner?
Walter Roberson
Walter Roberson 2021 年 7 月 3 日
X=categorical({'small','medium','large'});
X=reordercats(X,{'small','medium','large'});
Y=[5 18 56];
TestL={'Mon','Tue','Wed'};
figure()
b=bar(X,Y);
hold on
b.FaceColor = 'flat';
b.CData(1,:)=[1 0 0];
b.CData(2,:)=[0 1 0];
b.CData(3,:)=[0 0 1];
bh(1) = bar(nan,nan,'r');
bh(2) = bar(nan,nan,'g');
bh(3) = bar(nan,nan,'b');
legend(bh, string(X), 'location', 'northwest')

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Greg LANGE
Greg LANGE 2022 年 10 月 19 日
What should I change to have my "Tuesday" to have the same color as my bar ? (purple)
What should I do to have my label as my picture with coordonates ?
Thank you in advance
figure (5)
%modifié
X=categorical({'small','medium','large'});
X=reordercats(X,{'small','medium','large'});
Y=[5 18 56];
TestL={'Mon','Tue','Wed'};
figure()
b=bar(X,Y);
hold on
b.FaceColor = 'flat';
b.CData(1,:)=[1 0 0];
%b.CData(2,:)=[0 1 0];
b.CData(2,:)=[0.4940 0.1840 0.5560];
b.CData(3,:)=[0 0 1];
bh(1) = bar(nan,nan,'r');
bh(2) = bar(nan,nan);%
bh(3) = bar(nan,nan,'b');
bh(2).CData=[0.4940 0.1840 0.5560];
legend(bh, TestL, 'location', 'best') %'northwest'
%legent at the top
xtips1 = b(1).XEndPoints;
ytips1 = b(1).YEndPoints;
labels1 = string(b(1).YData);
text(xtips1,ytips1,labels1,'HorizontalAlignment','center',...
'VerticalAlignment','bottom')
ylabel('Energie [kWh]')

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