matlab - Using the if statement and for loop to write a program that generates N random numbers (and more) -

the question:

write matlab program that

i) generates n<=20 random numbers in interval [a,b], n, a, b entered via keyboard

my attempt:

a = input ('a=') b = input ('b=') n = input ('n=')   n = (1:n)      r = rand([a,b],[1,n])  end

doesn't seem work. following error messages appear

"??? subscript indices must either real positive integers or logicals."

what doing wrong?

ii) write numbers vector/array x

no idea how this? matter of putting r = x?

iii) write numbers divisible k screen, k entered via keyboard.

my attempt:

k = input ('k=') t = mod(x,k);   x = i:n   if mod(x,k) == 0   disp t   end  end

am anywhere near correct?

[i've never used stack-overflow before- having trouble formatting things appropriately] sorry

get n random numbers in range [a, b]:

a = input('a='); b = input('b='); n = input('n=');  % floating point: r1 = + (b-a)*rand(1, n); % integers: r2 = round(a + (b-a)*rand(1, n));

as can see, r1 , r2 in vector form, so:

x = r1; % or x = r2;

for last part (this print duplicates well):

k = input('k='); divs_found = find(mod(r, k) == 0); disp(r(divs_found));

DIs