Variable in function of 0

I need one of my variables in function of time zero (0) but I get an error in MATLAB saying that I need a positive number. how can I fix that?

ex: t = 0:1:1000

if t = 0 I(t) = a + b else I(t) = b - a

Answer 1

[Mischa Kim]

Maria, three things:

• The relational operator for comparison is ==.
• Indexing in MATLAB starts at 1, rather than 0, like in other programming languages. In other words, you cannot assign a value to t(0).
• t is a vector, so you could do, e.g., as part of a loop:

 ...
 if t(ii) == 0 
     I(t(ii) + 1) = a + b 
 else
     I(t(ii) + 1) = b - a
 end

[Patrik Ek]

Or simpler

t = 1:1001;
I(t) = b-a;
I(t==0) = a+b;

[Maria]

Thanks so much to both of you for the promt answer. I'll try that with my code. Maria Camila