MATLAB, how to input step functions.

[btbam91]

Hey guys, I am extremely inexperienced with MATLAB and I"m struggling putting this ode into matlab.

y' = -a*y+u(t-1)-u(t-3)

I know that for y=u(t-1), you type:

if t<1
y=0;
else
y=1;
end

and for y=u(t-3):
if t<3
y=0;
else
y=1;

But I'm confused as to how you'd combine all of the above into a correction function m file!

Thanks!

 

[viscousflow]

I am trying to understand your question here. Is your question you'd like to have a .m file that mimics the step function? type "help heaviside" see if that helps

 

[El_Nino]

Doesn't elseif solve the problem you are having?

if condition1
then something
elseif condition2
then something else
...
...
...
else
something
end