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create empty pie chart (or not generate the graph)

조회 수: 2 (최근 30일)
Alberto Acri
Alberto Acri 2023년 12월 1일
댓글: Voss 2023년 12월 1일
Hi! I would like to create empty pie chart (I know it is not very useful).
Using 'pie' does not allow this. so I had thought of generating a circle and placing the legend on the side. Is this possible?
matrix_new = [];
labels = matrix_new(:,1);
percentages = matrix_new(:,2);
figure
p = pie(percentages);
theta = linspace(0,2*pi,500);
line(cos(theta),sin(theta),'Color','k','LineWidth',0.6);
label_str = load("label_str.mat");
lgd.Title.String = "title";
If it's not possibile, how can I make it so that when 'matrix_new' is empty it doesn't generate the graph for me (so don't do anything)?

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Voss
Voss 2023년 12월 1일
Maybe something like this:
matrix_new = [];
figure
if isempty(matrix_new)
% matrix_new is empty: create the circle
theta = linspace(0,2*pi,500);
line(cos(theta),sin(theta),'Color','k','LineWidth',1);
% mimic pie() axes appearance:
axis off
axis equal
else
% matrix new is not empty: create the pie() chart
labels = matrix_new(:,1);
percentages = matrix_new(:,2);
p = pie(percentages);
end
% I'm not sure where this mat file comes from, but it should contain enough
% labels for the data in matrix_new:
label_str = load("label_str.mat");
% create the legend:
lgd = legend(label_str.label_str,'Location','EastOutside');
lgd.Title.String = "title";
  댓글 수: 2
Alberto Acri
Alberto Acri 2023년 12월 1일
yes, that's good. Can I ask if the legend can be moved a little to the left, for example?
Voss
Voss 2023년 12월 1일
Not sure about that.

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