Error: Array indices must be positive integers or logical values.

I have the following code:

theta = [0,45,60]

for i =1:3

if i-1 == 0;

theta(i-1) = 0

end

end

x=cosd(theta(i-1))

end

I keep getting the same error, I think its because you can't have an array of elements with an element at position zero, but I have already specified what I want it to be when that happens. Howc an I fix this?

Answer 1

[Ameer Hamza]

I am not sure what you are trying to do in your code. The following should work just fine

theta = [0,45,60]
x = cosd(theta)

Answer 2

[David Hill]

You are still indexing at zero. If you just want cosd at each theta then:

x=cosd(theta);

[Carlos Dolz]

My issue is that I want to have an index at zero, and knowing that in theory this is not possible, can't one specify a value for in this case theta when the index is zero?

I was trying to do that with the if statement

[David Hill]

Matlab does not allow indexing at zero. Indexing starts at 1. You never need to index at zero (you can always get around it).