am I having an matrix dimension because the name of the output ('III')?

Matrix dimensions must agree.

% Deficiency rating
if extent < 1
    deficiency = 'OK';
elseif extent >= 1 && extent < 5
    deficiency = 'IV';
elseif extent >= 5 && extent < 20
    deficiency = 'III';
elseif extent >= 20 && extent < 50
    deficiency = 'II';
elseif extent >= 50 && extent < 100
    deficiency = 'I';
end

% Reducing ratio

if deficiency == 'OK'
    alpha = 0;
elseif deficiency == 'IV'
    alpha = 0.05;
elseif deficiency == 'III'
    alpha = 0.20;
elseif deficiency == 'II'
    alpha = 0.50;
elseif deficiency == 'I'
    alpha = 1;
end

First I'm assigning a string value and then I will assign a numerical value according to it but I'm getting an error

Answer 1

[KSSV]

Read abot strcmp, use

strcmp(deficiency,'OK')

instead of

deficiency == 'OK'

[DulceEien]

thank you so much