Cases function: why do I get this message "array indices must be positive integers or logical values"

Hey,

I want to wrtie the following function in matlab:

I get this message

"array indices must be positive integers or logical values"

It says there is a problem with the line:

else x1(t) = 0;

My code, if someone can help me to fix this :)

t = linspace (-5, 5, 1001); 
if (abs(t) <= 1) 
    x1(t) = 1 - abs(t);
else x1(t) = 0;
end

Answer 1

[KSSV]

You should use logical indexing. Try something like this:

t = linspace (-5, 5, 1001); 
x1 = zeros(size(t)) ; 
x1(abs(t)<=1) = 1 - t(abs(t)<=1);
plot(t,x1)

[semicolon]

Thank you !

[KSSV]

Thanks is accepting answer here...:-)