MATLAB: Using a for-loop to score values in different intervals

Question

I need to use a for-loop (for a class, so we have to use the loop to do this) to find the score for the values of some vector 'x', which is a 30×1 vector containing values ranging from 0 to 6. These values are not integers. We are asked to produce a vector (I'll refer to it as 'y' here) with the 'scores' assigned, and the intervals and values for each score were provided as follows:

[0,1), score = 4

[1,2), score = 2

[2,3), score = 1

[3,5), score = 0

> 5, score = -5

I decided to write the following code to try and find a 30×1 vector with the score for each individual value of 'x':

for i = 1:30
    if 0 <= x(i) < 1
        y(i) = 4;
    elseif 1 <= x(i) < 2
        y(i) = 2;
    elseif 2 <= x(i) < 3
        y(i) = 1;
    elseif 3 <= x(i) < 5
        y(i) = 0;
    else
        y(i) = -5;
    end
end

However, after running this code with my 'x' vector, the output ('y') was a 30×1 vector containing a value of 2 for each number.

I double checked the x-values, and they did not all fall within the [1,2) interval, so I expected the score to differ throughout 'y'.

Any help or advice would be appreciated, especially if the way I decided to go about it was inefficient. I'm always open to new solutions or corrections to my attempt.

Thanks.

Answer 1

Correct form

if 0 <= x(i) && x(i) < 1