plot bar with two colors

Question

bekka mohamed 2020-10-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/622423-plot-bar-with-two-colors

评论： Rik 2020-10-22

hello,

i want to plot my bar in two colors conditions.if Tr<0 the color is red else the color is green. Ihqve tryed this but it didn't works.

can you help me please

T=readtable('file.xlsx');
A=T{:,:};
Tr=A(:,1);
EPR=A(:,2);
for i=1:length(A)
   h=bar(Tr,EPR)
   hold on 
   if (Tr<0)
       barcolor='r';
   else
       barcolor='g'
   end
end

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Answer 1

Andy 2020-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/622423-plot-bar-with-two-colors#answer_521328

在 MATLAB Online 中打开

figure();
hold on
for i=1:length(A)
   
   if (Tr(i)<0)
       h=bar(Tr(i),EPR(i),'r');
   else
       h=bar(Tr(i),EPR(i),'g');
   end
end
hold off

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Rik 2020-10-22

Just a note: it is bad design to use length for matrices. It is also probably not a good idea to create many bar objects, as that many graphics objects may cause performance issues.

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Answer 2

Rik 2020-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/622423-plot-bar-with-two-colors#answer_521253

编辑：Rik 2020-10-22

在 MATLAB Online 中打开

If you insist on separate bar objects you can use the first part, if not, you can use the second part

figure(2),clf(2)%ensure a clean figure for this example
A=rand(10,2)*5-2.5;%generate random data
Tr=A(:,1);
EPR=A(:,2);
subplot(1,2,1)
%for i=1:length(A)
for n=1:size(A,1)% or since R2020b: n=1:height(A)
    width=0.05;
    h=bar(Tr(n),EPR(n),width);
    hold on
    if (Tr(n)<0)
        h.FaceColor='r';
    else
        h.FaceColor='g';
    end
end
subplot(1,2,2)
L=Tr<0;
EPR_part=EPR;EPR_part(~L)=NaN;% this step is only require to make the bars the same width
bar(Tr,EPR_part,'r'),hold on
EPR_part=EPR;EPR_part( L)=NaN;
bar(Tr,EPR_part,'g'),hold off