Issues plotting simple bar graph.

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Scuba 2023-3-20

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https://ww2.mathworks.cn/matlabcentral/answers/1931590-issues-plotting-simple-bar-graph

评论： Scuba 2023-3-20

Hello, I have simplified the example problem down to what you see. I have two variables size 11x1 with correspoding data. That said, once I try and plot it comes up with this error as shown below, could someoe care to explain and show what i can do to work around this. I don't understand why this wont work, both array sizes are the same it should plot x and y coordinates respectively?

A = [0.1; 0.4; 1.1; 2.2; 2.5; 0.2; 2.5; 2.2; 1.1; 0.4; 0.1];

B = [25; 20; 15; 10; 5; 0; 5; 10; 15; 20; 25];

bar(B, A);

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Answer 1

VBBV 2023-3-20

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https://ww2.mathworks.cn/matlabcentral/answers/1931590-issues-plotting-simple-bar-graph#answer_1196335

编辑：VBBV 2023-3-20

在 MATLAB Online 中打开

 A = [0.1; 0.4; 1.1; 2.2; 2.5; 0.2; 2.5; 2.2; 1.1; 0.4; 0.1];
B = [25; 20; 15; 10; 5; 0; 5; 10; 15; 20; 25];
bar(A); 
xticks(1:length(A));
xticklabels({B})

As @cyclist mentioned , you need to code it differently if you want to group or stack them. But if you still want the values in the same order as you mentioned, one option is to work with xticks and xticklabels

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Scuba 2023-3-20

Thank you, I realised i've been doing bar graphs wrong in Matab... plot just the x and working with xticks and xticklabels is the way to go.

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Answer 2

the cyclist 2023-3-20

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https://ww2.mathworks.cn/matlabcentral/answers/1931590-issues-plotting-simple-bar-graph#answer_1196330

编辑：the cyclist 2023-3-20

在 MATLAB Online 中打开

The error message is quite clear. Your X values are not unique.

Let's look at a simpler example:

x = [1 2 2];
y = [3 5 7];
bar(x,y)
Error using bar
XData values must be unique.

It is clear that at x==1, there should be a bar of height y==3.

But would should the bar be at x==2? Should it be 5? 7? 5+7? A bar with two sections? It is not clear, which is why the x values need to be unique.

If you want stacked or group bars, you need to code this differently.

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Scuba 2023-3-20

I see, could i just plot the x values and change the x value lettering to what i want?

Scuba 2023-3-20

Thank you @the cyclist

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