How to use boxchart()?

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Louise Wilson 2020-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/646443-how-to-use-boxchart

评论： Fuqiang Guo 2021-12-23

I am trying to use a boxchart for the first time as opposed to a boxplot, as it looks to have better functionality for what I want to do.

But, it's not working and I can't understand what's wrong...

On the x axis I would like to have 22 different dates, represented on the y by a box plot of 22*144 data points.

boxchart(data_dB1,dates_concatenated)
Error using boxchart
Expected ydata to be one of these types:
double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64
Error in boxchart (line 95)
validateattributes(ydata,{'numeric'},{'2d','real'},mfilename,'ydata');

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采纳的回答

Cris LaPierre 2020-11-13

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编辑：Cris LaPierre 2020-11-13

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I think the error is because you are using the syntax boxchart(xgroupdata,ydata), but your inputs are reversed. You put the grouping variable second. Also, your grouping data is not valid for use as xgroupdata.

From the documentation, if you want to use a cell array of characters, you must use the syntax

boxchart(___,'GroupByColor',cgroupdata)

Therefore, try changing your code to

boxchart(data_dB1,'GroupByColor',dates_concatenated)

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Cris LaPierre 2020-11-17

编辑：Cris LaPierre 2020-11-17

在 MATLAB Online 中打开

I had to do some investigation myself first. I found this example extremely helpful. Basically, in order to create the plot you want using boxchart, you need to convert your inputs into vectors. All the data needs to be in a single column. To work, you also need to do the following

create an xgroup vector that indicates which column the corresponding value originally came from.
create a cgroupdata vector that indicates which data set the corresponding value came from.

I came up with something like this.

% load your data

load data_dB1.mat

load data_dB2.mat

load data_dB3.mat

% Convert each data set into a column vector.

% the (:) basically stacks all columns on top of each other. First #1, the 2 under it, then 3, ...

dB1 = data_dB1(:);

dB2 = data_dB2(:);

dB3 = data_dB3(:);

% Combine all 3 data sets into a single column vector

dB = [dB1;dB2;dB3];

% Create a corresponding x-vector, indicating which column each row came from

x=ones(size(data_dB1,1),1)*(1:size(data_dB1,2));

x = [x(:);x(:);x(:)];

% convert to dates

d=datetime(2019,8,20):days(1):datetime(2019,9,10);

d=categorical(d(x));

% Create a group vector, indicating which data set each row came from

G = ones(size(dB1));

G = [G;G*2;G*3];

% Create boxchart

boxchart(d,dB,'GroupByColor',G)

ylim([80 150]);

legend(["50-24,000 Hz","50-5000Hz","50-1500 Hz"]);

xlabel('Date','FontSize',14); ylabel('SPL_{rms}', 'FontSize',14);

Cris LaPierre 2021-12-16

boxchart was introduced in R2020a. If you have the Statistics and Machine Learning toolbox, you can use boxplot instead. Otherwise, you will need to update your MATLAB version to at least R2020a.

Fuqiang Guo 2021-12-23

Thank you very much, your advice is very helpful, I'll update my software version

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