How can I add an automatic legend to a graph with 10+ lines?

I'm trying to generate a graph that has potentially 50 lines on it. In terms of formatting, I only know of the command "legend('Title 1''Title 2'....'Title n'). Given the number of lines I need to plot, I was wondering if there was a way to generate these titles automatically so if I increase the number of lines I don't have to manually add more titles in the legend.