PLOTA

PLOTA plots each new plot using other color.

PLOTA is the same as standard PLOT function, BUT it plots each new plot using other color ( making 'hold on' automatically and cycling through the colors in the order specified by the current axes ColorOrder property )

EXAMPLE:
figure;
plota(randn(1,100));
plota(randn(1,100));
plota(randn(1,100));
legend('First call to plota', 'Second call to plota', 'Third call to plota')