Simple question regarding bar plot with categorical data
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maho
el 6 de Oct. de 2017
Hello guys,
I am new to matlab, and I'm trying to do a simple bar plot, like this:
x = ["bananas" "apples" "cherries"];
y = [14,12,7];
bar(categorical(x),y);
The problem is that bar() function seems to sort the x-labels in alphabetical order. Is there any way to override this behaviour, so that the x-labels are left in their original order?
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Respuesta aceptada
Sean de Wolski
el 6 de Oct. de 2017
Editada: Sean de Wolski
el 6 de Oct. de 2017
x = categorical(["bananas" "apples" "cherries"]);
x = reordercats(x,{'bananas' 'apples' 'cherries'});
y = [14,12,7];
bar(x,y);
Categoricals can have order associated with them (for the purpose of relational operators).
6 comentarios
tesarj13
el 23 de Nov. de 2020
Even better with coversion to string:
x = categorical(["bananas" "apples" "cherries"]);
x = reordercats(x,string(x));
y = [14,12,7];
bar(x,y);
Más respuestas (4)
Steven Lord
el 6 de Oct. de 2017
If you're using release R2016b or later you could use histogram with a vector of BinCounts instead of using bar.
x = ["bananas" "apples" "cherries"];
C = categorical(x);
y = [14,12,7];
h = histogram('Categories', C, 'BinCounts', y);
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Souarv De
el 8 de Abr. de 2021
Editada: Souarv De
el 8 de Abr. de 2021
I also faced the same issue. There are numerous shortcut techniques available to solve it out. What I used to follow is as below :
x = categorical(["bananas" "apples" "cherries"]);
x = reordercats(x,cellstr(x)');
y = [14,12,7];
bar(x,y);
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/577262/image.jpeg)
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Rik
el 6 de Oct. de 2017
Editada: Rik
el 6 de Oct. de 2017
The problem is not in bar, but in categorical. I can't find in the doc how to preserve order (with unique I know there is a switch to do so). So my suggestion would be to convert it yourself:
[~,ia,~]=unique(x,'stable');
x2=1:length(x);
x2=x(ia);
bar(x2,y)
xticks(x2)
xticklabels(x)%might not work, as this expects a cell stray containing strings
Of course, your labels are very likely to be unique, otherwise bar wil most likely yield an error, so this should work the same in all valid situations:
x2=1:length(x);
bar(x2,y)
xticks(x2)
xticklabels(x)%might not work, as this expects a cell stray containing strings
2 comentarios
Rik
el 6 de Oct. de 2017
xticklabels and xticks were introduced in R2016b, so for earlier releases you should use gca and set the XTick and XTickLabels properties.
michael dupin
el 3 de Oct. de 2022
Editada: michael dupin
el 3 de Oct. de 2022
*** Use histogram and not bar :)
I've been struggling with this until now, so sharing with the community. You can use the histogram simply as a drawing function, not actually counting anything.
Including the vertical bars as well (instead of "barh"), as long labels are typically better displayed horizontally.
Et voila! Good luck. Mike
x = ["bananas" "apples" "cherries"];
y = [14,12,7];
histogram('Categories',x,'BinCounts',y,'orientation','horizontal');
histogram('Categories',x,'BinCounts',y);
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