add text above the legend on pie chart

Question

Alberto Acri 2023-9-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2020446-add-text-above-the-legend-on-pie-chart

评论： Les Beckham 2023-9-13

matrix_out_INF_web.mat

在 MATLAB Online 中打开

Hi! I would like to add text above the legend (as shown). Is there the possibility of doing this?

Here is the code:

matrix = importdata("matrix_out_INF_web.mat");
% ===============
% Filter the matrix to include only rows with percentage values < 5
matrix_new = matrix(matrix(:,2) < 5, :);
tot_percent_subgraph = sum(matrix_new(:,2));
% Extract the labels and corresponding percentages for the pie chart
labels = matrix_new(:,1);
percentages = matrix_new(:,2);
% Create the pie chart with labels
figure
p = pie(percentages);
% Set 'TextType' property to 'none' to remove percentage labels
hText = findobj(p, 'Type', 'text');
percentValues = get(hText, 'String');
combinedText = strcat(percentValues, ' %');
for i = 1:numel(hText)
    set(hText(i), 'String', '');
end
str = [string(labels') ""];
for k=1:numel(hText)
    hText(k).String = str(k);
end
x = labels(percentages == 0); % extract all labels with percentage == 0
for i=1:numel(x)
    textObj = findobj(p, 'String', x(i)); % find the label in pie chart
    set(textObj, 'String', ''); % hide the label
end
% Display the matrix_new values in the pie chart
label_str = arrayfun(@(x, y) sprintf('%d (%d%%)', x, y), matrix_new(:, 1), matrix_new(:, 2), 'UniformOutput', false);
% Colore 
pPatch = findobj(p, 'Type','Patch');
cm = colormap(turbo(numel(pPatch)));    % Colour Array (Can Be Whatever You Define It To Be)
for k = 1:numel(label_str)
    pPatch(k).FaceColor  = cm(k,:);   % Colour Each Patch Individually
%     pText(k).FontSize = 12;
end
% Add labels to the pie chart
lgd = legend(label_str, 'Location', 'EastOutside','FontSize',12);
lgd.NumColumns = 2;
text = "percentage values";
lgd1 = legend(text, 'Location', 'northoutside','FontSize',12);

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Answer 1

Adam 2023-9-13

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2020446-add-text-above-the-legend-on-pie-chart#answer_1309271

编辑：Adam 2023-9-13

在 MATLAB Online 中打开

I can't run your code to test, but

lgd1.Title.String = "percentage values"

should work (instead of passing it into the call to the legend function)

Beware of naming a variable 'text' though - it hides the function of the same name within Matlab.

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Star Strider 2023-9-13

在 MATLAB Online 中打开

matrix_out_INF_web.mat

You can run it. Click on the ‘paperclip’ icon, then ‘Link from this thread’ then check the appropriate box for the attachment. After that, click on the ‘Insert a line of code (Alt+Enter)’ icon to create a code section copy the code and paste it to the code section. Enter your changes, then run it using the green ‘Run’ icon.

Doing that here and adding your contribution to it —

matrix = importdata("matrix_out_INF_web.mat");

% ===============

% Filter the matrix to include only rows with percentage values < 5

matrix_new = matrix(matrix(:,2) < 5, :);

tot_percent_subgraph = sum(matrix_new(:,2));

% Extract the labels and corresponding percentages for the pie chart

labels = matrix_new(:,1);

percentages = matrix_new(:,2);

% Create the pie chart with labels

figure

p = pie(percentages);

% Set 'TextType' property to 'none' to remove percentage labels

hText = findobj(p, 'Type', 'text');

percentValues = get(hText, 'String');

combinedText = strcat(percentValues, ' %');

for i = 1:numel(hText)

set(hText(i), 'String', '');

end

str = [string(labels') ""];

for k=1:numel(hText)

hText(k).String = str(k);

end

x = labels(percentages == 0); % extract all labels with percentage == 0

for i=1:numel(x)

textObj = findobj(p, 'String', x(i)); % find the label in pie chart

set(textObj, 'String', ''); % hide the label

end

% Display the matrix_new values in the pie chart

label_str = arrayfun(@(x, y) sprintf('%d (%d%%)', x, y), matrix_new(:, 1), matrix_new(:, 2), 'UniformOutput', false);

% Colore

pPatch = findobj(p, 'Type','Patch');

cm = colormap(turbo(numel(pPatch))); % Colour Array (Can Be Whatever You Define It To Be)

for k = 1:numel(label_str)

pPatch(k).FaceColor = cm(k,:); % Colour Each Patch Individually

% pText(k).FontSize = 12;

end

% Add labels to the pie chart

lgd = legend(label_str, 'Location', 'EastOutside','FontSize',12);

lgd.NumColumns = 2;

text = "percentage values";

lgd1 = legend(text, 'Location', 'northoutside','FontSize',12);

lgd1.Title.String = "percentage values";

@Alberto Acri — It is best not to use ‘text’ as a variable because that overshadows the text function that you may want to use elsewhere in your code, and will then not be able to.

.

Alberto Acri 2023-9-13

Thanks for the clarification @Star Strider but the result is not what I wanted to achieve.

I also need to keep the legend on the right. See the image I posted at the beginning of the question.

Les Beckham 2023-9-13

在 MATLAB Online 中打开

matrix_out_INF_web.mat

Just remove the second call to legend, which, I assume, was your attempt at adding the legend title.

See below:

matrix = importdata("matrix_out_INF_web.mat");

% ===============

% Filter the matrix to include only rows with percentage values < 5

matrix_new = matrix(matrix(:,2) < 5, :);

tot_percent_subgraph = sum(matrix_new(:,2));

% Extract the labels and corresponding percentages for the pie chart

labels = matrix_new(:,1);

percentages = matrix_new(:,2);

% Create the pie chart with labels

figure

p = pie(percentages);

% Set 'TextType' property to 'none' to remove percentage labels

hText = findobj(p, 'Type', 'text');

percentValues = get(hText, 'String');

combinedText = strcat(percentValues, ' %');

for i = 1:numel(hText)

set(hText(i), 'String', '');

end

str = [string(labels') ""];

for k=1:numel(hText)

hText(k).String = str(k);

end

x = labels(percentages == 0); % extract all labels with percentage == 0

for i=1:numel(x)

textObj = findobj(p, 'String', x(i)); % find the label in pie chart

set(textObj, 'String', ''); % hide the label

end

% Display the matrix_new values in the pie chart

label_str = arrayfun(@(x, y) sprintf('%d (%d%%)', x, y), matrix_new(:, 1), matrix_new(:, 2), 'UniformOutput', false);

% Colore

pPatch = findobj(p, 'Type','Patch');

cm = colormap(turbo(numel(pPatch))); % Colour Array (Can Be Whatever You Define It To Be)

for k = 1:numel(label_str)

pPatch(k).FaceColor = cm(k,:); % Colour Each Patch Individually

% pText(k).FontSize = 12;

end

% Add labels to the pie chart

lgd = legend(label_str, 'Location', 'EastOutside','FontSize',12);

lgd.NumColumns = 2;

text = "percentage values";

% lgd1 = legend(text, 'Location', 'northoutside','FontSize',12);

lgd.Title.String = "percentage values"; % <<< add the title here

% text = "percentage values"; % <<< get rid of this

% lgd1 = legend(text, 'Location', 'northoutside','FontSize',12); % <<< get rid of this

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add text above the legend on pie chart

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add text above the legend on pie chart

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