How can I change bar graph x-axis?

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MByk
MByk 2021-8-11
评论： dpb 2021-8-12
Hello, I want to order my bar graph (left hand side) in descending order but didn't succeed in ordering x-axis labels (right hand side). Values in x-axis are feature indices. How can I fix it? Thanks for the help.
[a,b] = sort(Scores_Avg,2,'descend')
bar(Scores_Avg(b))
text(1:length(a), a', num2str(a','%0.3f'),...
'HorizontalAlignment','center','VerticalAlignment','bottom');
set(gca,'XTick',b);

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dpb
dpb 2021-8-11
编辑：dpb 2021-8-11
[a,ia] = sort(Scores_Avg,2,'descend'); % use more meaningful index variable
bar(a) % plot the sorted array vs linear order
xticks(1:numel(a)) % set the tick marks to match bar number
xticklabels(ia) % label x ticks to go with sorted order
...
You need to first also set xticks to the full number of bins if there are enough bars that the default tick marks don't put that many tick marks on the axes.
NB: the caveat in the comment below -- as N grows, space starts to get very dear...
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dpb
dpb 2021-8-12
No problem; realized later shoulda' just done it that way originally because you can't count on the default ticks. Bad implementation choice internally, but just one of the many warts in bar().

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Henry Barth
Henry Barth 2021-8-11
set(gca,'XtickLabels',arrayfun(@num2str,b,'UniformOutput',false));

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