How to draw a bar graph from cell array with different size length?

Question

Chin 2012-1-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26222-how-to-draw-a-bar-graph-from-cell-array-with-different-size-length

采纳的回答： Matt Tearle

For example, i have a = [{1}; {[3 5]}; {[4 6 7]}; {[3 6 7 9]}]. How do I plot the cell array in one bar graph?

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C.J. Harris 2012-1-16

How would you link the data you have provided to the legend (as shown in your example figure)? In the example groups 3 & 5 have only two bars, but it is clearly item 003 which is missing.

The data you have provided doesn't make it clear which elements are missing from each group - and therefore you run the risk of having very misleading bar colours.

Chin 2012-1-16

Actually i can plot it using excel but I would like to try it from matlab see it can be done via matlab. Is that possible to append 0 behind the cell array so that a = [{[1 0 0 0]}; {[3 5 0 0]}; {[4 6 7 0]}; {[3 6 7 9]}] and then plot it in grouped bar graph?

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Answer 1

Matt Tearle 2012-1-16

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This will extract the values and add zeros to the end, then extract all to a matrix. But are you sure the missing values are always at the end? A safer approach would be to import with NaN placeholders where the values are missing. How are you importing the data?

a = [{1}; {[3 5]}; {[4 6 7]}; {[3 6 7 9]}];
n = max(cellfun(@length,a));
f = @(x) [x,zeros(1,n-length(x))];
a = cellfun(f,a,'UniformOutput',false);
x = cat(1,a{:})
bar(x')

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Matt Tearle 2012-1-16

Oh, yes, sorry I misunderstood which way you wanted them grouped. That's good: bar(x) is even neater than having to transpose.

Chin 2012-1-16

sorry for another question. now i am facing another problem. if the cell array a = [[{1}; {[3 5]}; {[4 6 7]}; {[3 6 7 9]}] [{3}; {[7 1]}; {[8 2 7]}; {[3 5 7 4]}]]. How do I plot it into two bar graph? Which means that a{1, 1} will have first bar graph while a{1, 2} will have another bar graph. Thank you.

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Answer 2

C.J. Harris 2012-1-16

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If you are going to pad out your arrays with zeros you don't even need to define it as a cell array, just use a matrix.

Try this:

a = [1 0 0 0; 3 5 0 0; 4 6 7 0; 3 6 7 9];
bar(a,'group')

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Chin 2012-1-16

However, my result is generated in different size cell array.

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Answer 3

Walter Roberson 2012-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/26222-how-to-draw-a-bar-graph-from-cell-array-with-different-size-length#answer_34263

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L = max(cellfun(@length, a));
bar( cell2mat( @(V) [V, zeros(1,L-length(V))], a, 'Uniform', 0), 'group' )

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Walter Roberson 2012-1-16

bar( cell2mat( cellfun(@(V) [V, zeros(1,L-length(V))], a, 'Uniform', 0)), 'group' )

Chin 2012-1-16

thanks. This is correct graph. Besides, now I am plotting another two graph from cell array a = [[{1}; {[3 5]}; {[4 6 7]}; {[3 6 7 9]}] [{3}; {[7 1]}; {[8 2 7]}; {[3 5 7 4]}]]. One is graph is from a{:,1} and the second one is from a{:, 2}. I can plot the bar graph but the bar graph consists of same colour compare to only one graph that can have multiple colour. What I am missing? Thanks again for helping.

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