MATLAB: How to have more than one box plot in one plot

MATLABplot

Hey all,

I'm unable to plot more than one box plot in one figure. My data sets are seven n x 1 double (every double array of this seven and I have 7 of them which I want to have boxplots for every 7 data set in one figure, something like this:

Sample data are provided, I have 7 file like this

Thank you all.

Best Answer

Please refer to my answer here: https://www.mathworks.com/matlabcentral/answers/392679-how-to-fill-boxes-in-boxplot-with-different-colors

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MATLAB: How to merge multiple graphs/vectors in one!

To begin with, your data are apparently all row vectors, so I would concatenate them as cell arrays:

xall = {fliplr(x1); fliplr(x2); x3; x4; fliplr(x5); fliplr(x6); x7; x8};
yall = {fliplr(y1); fliplr(y2); y3; y4; fliplr(y5); fliplr(y6); y7; y8};
figure(1)
hold on
for k1 = 1:size(xall,1)
    plot(xall{k1}, yall{k1}, 'x')
end
hold off

I would not bother with unique, since the points will simply overplot each other, since you’re plotting them as discrete points and not as lines. In R2014b, the colours will cycle automatically. Otherwise, you will have to cycle through the colours yourself, but that is not difficult.

MATLAB: Display mean of data on a boxchart

"??? There's a boxplot, no info on boxchart"

Well, bless their little pea-pickin' hearts but TMW has done it again...introduced yet another duplicated function with different name and slightly different syntax/characteristics. I wish they would quit doing that and do something really new and different like introduce a hatching pattern or something instead...

Anyways my rant aside, looks like you're going at this the hard way. Reading between the lines, it looks like you have a cell array of numel() elements and you're iterating over it to plot each cell separately.

Instead

figure;
y=cellmat(data);                            % convert the cell array to matrix
hBx=boxchart(y,'MarkerStyle','none', ...    % do the box plot
               'BoxFaceColor', colors(i,:), ...
               'LineWidth', 0.5, ...
               'WhiskerLineStyle', '-');
hold on                       
hLmn=plot(1:size(y,2),mean(y), '*','r');    % and the stars for means
hAx=gca;
hAx.XTick=[];

Only two caveats:

each element in data is same number points; if this isn't so, will need to augment the shorter cells to length of longest with NaN, and
the data in each cell are column vectors--if rows, then transpose the y array before calling boxchart

You can stick with the existing way of generating an unneeded x variable to fake out barchart by giving an artificial grouping variable, but that's kinda' messy way. If they were going to write a new one, don't know why didn't allow for an x axis variable while at it other than simply the only grouping variable option.

N=numel(data);
colors = rand(N, 3);
figure;
hAx = axes();
hold on
for i=1:N
  boxchart(i*ones(size(data{i})), data{i},'MarkerStyle','none', ...
                                          'BoxFaceColor', colors(i,:), ...
                                          'LineWidth', 0.5, ...
                                          'WhiskerLineStyle', '-')
  plot(i,mean(data{i}),'*r')  % you didn't put in an x coordinate so all plotted at 1,mean(y)
end
set(gca,'xtick',[])

I'd recommend looking at vectorizing instead of the latter, though...

Best Answer

Related Solutions

MATLAB: How to merge multiple graphs/vectors in one!

MATLAB: Display mean of data on a boxchart

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