how to compare multiple plots of filter by different colors in a same window?

i just have designed few different filters using FDA tool and i want to see them together in a single window by different colors. How it can be done? and how we can generate the transfer function of a filter directly from a FDA tool?

Answer 1

[Iain]

Generic answer:

 t = 0:timestep:time_end; % supply your own "time" values
 x1 = sin(t); % output of filter 1
 x2 = cos(4*pi*t); % output of filter 2

Then:

 plot(t,x1,t,x2)

OR

 plot(t,x1,'r') % red
 hold on
 plot(t,x1,'m') % magenta

OR

 plot(t,x1) % default (blue)
 hold all
 plot(t,x2) % default 2nd colour (red)