How to solve this error "Operands to the || and && operators must be convertible to logical scalar values." ?

I want matlab to display the new y values but i keep getting the error.

y = [5000 17000 25000 75000];

if y < 10000

ty = 200;

elseif y > 10000 && y < 20000

ty = (200 + 0.1*(y - 10000));

elseif y > 20000 && y < 50000

ty = (1200 + 0.15*(y - 20000));

elseif y > 50000

ty = (5700 + 0.25*(y - 50000));

end

Answer 1

[KSSV]

Your input should be a scalar..i.e y should be a scalar.

y_val = [5000 17000 25000 75000];
ty = zeros(size(y_val)) ; 
for i = 1:length(y_val)
    y = y_val(i) ; 

if y < 10000
    ty(i) = 200;
elseif y > 10000 && y < 20000
    ty(i) = (200 + 0.1*(y - 10000));
elseif y > 20000 && y < 50000
    ty(i) = (1200 + 0.15*(y - 20000));
elseif y > 50000
    ty(i) = (5700 + 0.25*(y - 50000));
end
end

[Jason Nguyen]

sorry, i want the values of ty. I want matlab to produce all four values of 'ty'

[KSSV]

Edited the answer.

[Jason Nguyen]

thanks so much!!!