Bar chart samples are shuffled

Question

Iron1759 2021-10-2

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https://ww2.mathworks.cn/matlabcentral/answers/1465284-bar-chart-samples-are-shuffled

编辑： dpb 2021-10-3

Hi,

I want to create a stacked bar chart that is ordered according to total values; however, no matter what I do it seems that dispite the values matrix for the bar chart, the stacks are shuffled around regardless the order of values in the matrix:

here is the ordered values matrix according to total values - each row represents a sample and contains two observations:

89817512249006	10.6114775114530
97084136825914	10.6925827879448
48697169408196	10.9541916851987
68518825475912	10.8490244459713
0674964213323	11.5608323808692

The categorical variable:

X = {'Pristine'	'Ne'	'He'	'Ar'	'Kr'};
b = bar(X,vals,'stacked');

and the result attached - like the rows and X are mixed.

Really don't know what's going on.

Thanks!

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Answer 1

dpb 2021-10-2

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1465284-bar-chart-samples-are-shuffled#answer_800044

编辑：dpb 2021-10-2

在 MATLAB Online 中打开

As @Star Strider says, categorical variables are not ordinal by default and are valued by lexical sorting. To fix

X = {'Pristine'	'Ne'	'He'	'Ar'	'Kr'};
X=categorical(X,X,"Ordinal",1)
hB = bar(X,E,'stacked');
...

Produces

in which the order is preserved since X is now an ordinal categorical array.

You can generalize the above by using sort with the optional returned index array by which to reorder the categorical values array to match the data order desired or for different datasets before creating the categorical variable.