using while loops and random number generators

var = 'y';
while (var=='y')
    u=input('how many?', 's');
    if (u > 0)
       r = rand(1,u,'single'); 
       randnum = ['Your Random Number Is:', num2str(r)];
       disp(randnum);
       var = input('Continue?', 's');
    end
    if (var ~='y')
        disp('Program Terminated');
    end
end

Problem asked to write a code where the user types a number (the amount of random numbers they want) and asked if they would like to continue generating random numbers (works if they type 'y'). If they type any other letter, the program is terminated. I've written this code for individual random numbers, but when i try to include the "how many" part, I get errors. I keep struggling with the r = rand(1,u,'single'); line. No matter how many times I change the code and try new things it doesn't work. How would I fix this error and allow the code to work properly?

Answer 1

[Kevin Phung]

you needed one more line:

var = 'y';
while (var=='y')
    u=input('how many?', 's');
    u = str2num(u);  % u was a char, not a numeric. 
    if (u > 0)
       r = rand(1,u,'single'); 
       randnum = ['Your Random Number Is:', num2str(r)];
       disp(randnum);
       var = input('Continue?', 's');
    end
    if (var ~='y')
        disp('Program Terminated');
    end
end

note: you didnt need the 's' argument in input()