Bar chart samples are shuffled

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:

8.89817512249006	10.6114775114530
8.97084136825914	10.6925827879448
9.48697169408196	10.9541916851987
9.68518825475912	10.8490244459713
10.0674964213323	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!

Answer 1

[dpb]

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.

[Iron1759]

Without the 'E' :)

Thanks!

[dpb]

I used E as local variable based on the title in your graph...