Why does the command window say "Array indices must be positive integers or logical values" when this code is executed?

p = 280000;         % Principal loan amount
r = 0.0475;         % Interest rate as decimal
y = [10, 20, 30];   % Number of years for loan

% Calculations
m = (p(r/12)) / (1-(1+(r/12)^(-12*y(1))));   % Monthly cost

Array indices must be positive integers or logical values.

I tried multiple values but it keeps giving me the same result. The numbers are positive and the index is not incorrect.

fprintf('For a loan duration of %g years and a principal amount of %.2f at an interest rate of %.4f%%, the monthly payment will be %.2f', y(1), p, r, m)

Answer 1

[Torsten]

Maybe you mean

(p*(r/12))

instead of

(p(r/12))

?

[Angelica]

Yes, that fixed it. Thank you. Sorry for the silly mistake.