labelplot

This short function will generate a legend based on 'Tag' information given by plot. A legend title is also possible.

figure; hold on; x = 1:10; plot(x,x,'Tag','Positive'); plot(x,-x,'Tag','Negative'); labelplot('eo','v','Slope');

The above example is equivalent to
legend('Positive','Negative')
and adding a text box 'Slope' above it.