How do i rectify this issue "Subscript indices must either be real positive integers or logicals."

c1= zeros(250,2);

for w = 0:1:50
k=(w-1)/0.1;
if (w)>50 % if the package is greater than 50Kg, the package is overweight
   fprintf('error package is overweight');
elseif (w)<=1.0 %if the weight is less than 1kg, then the cost is £10
    c=10;    
    %fprintf('$%.2f \n',c)
elseif (w)<35 % if the weight is greater than 1Kg but less than 35Kg, a surcharge of £1.45 is added for every 100g
    c=((10+(1.45*k)));
    %fprintf('$%.2f \n',c)
elseif (w)>35.0 && (w)<=50 % if the weight is greater than 35Kg but less than 50Kg, an extra charge of £10 is added
    c=20+(1.45*k);
    %fprintf('$%.2f \n',c)
end

c1(w,:) = [w c(w)]
end
%plot(w,c1);
% xlabel('Weight of the package');
% ylabel('Cost of the delivery');
% title('The Relation Between Weight of a package and Cost of sending it');
% grid on
%end

Answer 1

[Walter Roberson]

You have

for w = 0:1:50

so w starts from 0.

You then compute c with no subscript, assigning a scalar each time.

You then have

 c1(w,:) = [w c(w)]

which attempts to examine subscripted c. Because c is a scalar, the only possible valid subscript is 1 . But you are indexing with w, which is 0.

[chizom wornu]

yea, i just figured it out thank you.