How do I get a correct assignment of my legend when I create a Pie chart with empty values in MATLAB 7.9 (R2009b)?

Pie charts with values equal to zero do not generate a patch object and then the figure contains less elements than expected leading to the wrong assignment in the legend.

figure

weights = [1 0 1 ]

pie( weights )

names = { 'blue' 'green' 'red' };

legend( names ) % <- Not good

Answer 1

[MathWorks Support Team]

The ability to add a legend with correct assigned text labels is not available in MATLAB 7.9 (R2009b) when creating a PIE chart with empty values.

To work around this issue use the following command:

legend(names(weights>0))