Pie chart label overlapping

Hey guys so I have a pie chart with labels like 1%,2% <1% and because there are 100 values it overlaps quite a lot.

I am able to remove all labels with delete(findobj(p,'Type','Text'))

Is there any way to remove just the ones with <1% or somehow group the labels together?

Answer 1

[Adam Danz]

> Is there any way to remove just the ones with <1% or somehow group the labels together?

Starting in MATLAB R2024b, piechart offers the NumDisplayWedges property that lets you set the number of wedges and puts the remaining date into an "other" category. When used with the DisplayOrder property, you can show all data that is greater than 1%.

data = [linspace(0,1,20),linspace(.5,2,10),linspace(1,10,20)];

h = piechart(data,'DisplayOrder','descend','LabelStyle','percent');
h.NumDisplayWedges = sum(h.Data>1)-1; % show all data >1%

Using the older pie function

Use the pie() output handle to obtain the text objects.

h = pie(. . .);

th = findobj(h,'Type','Text'); % text handles

Determine which text strings begin with "<"

isSmall = startsWith({th.String}, '<'); % r2016b or later

% isSmall = ~cellfun(@isempty, regexp({th.String},'^<')); % any matlab release

Either delete the text objects or replace their String values with empties.

delete(th(isSmall));

%or

set(th(isSmall),'String', '')

Demo:

% h = pie(sort(data));

[Giuseppe Degan Di Dieco]

Dear Adam,

you're awesome, your help was so precious.

Thanks, best.

Answer 2

[Toder]

Following the documentation for pie chart labels at https://www.mathworks.com/help/matlab/creating_plots/customize-pie-chart-labels.html, we can get the labels. Then a simple for loop can remove the ones you don't want.

x = [0.1 50 50];
p = pie(x);
pText = findobj(p,'Type','text');
for i=1:length(x)
    if strcmp(pText(i).String,'< 1%')
        pText(i).String = '';
    end
end

[Giuseppe Degan Di Dieco]

Hi Toder,

your tip is brilliant too.

Thanks for your help, and best!