CODEWITHSUNDEEP
matlabrandommodulo
Siyanda
Siyanda

Reputation: 131

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

The question:

Write a matlab program that

i) generates N<=20 random numbers in the interval [a,b], where N, a, b are entered via keyboard

My attempt:

a = input ('a=')
b = input ('b=')
N = input ('N=')

 for N = (1:N)
     r = rand([a,b],[1,N])
 end

doesn't seem to work. The following error messages appear

"??? Subscript indices must either be real positive integers or logicals."

What am I doing wrong?

ii) write the numbers to a vector/array x

NO idea how to do this? Is it simply a matter of putting r = x?

iii) write all the numbers divisible by k to the screen, k is entered via the keyboard.

My attempt:

k = input ('k=')
t = mod(x,k);

 for x = i:N
  if mod(x,k) == 0
  disp t
  end
 end

Am I anywhere near correct?

[I've never used stack-overflow before- having trouble formatting things appropriately] Sorry

Upvotes: 0

Views: 735

Answers (1)

rascob
rascob

Reputation: 463

Get N random numbers in range [a, b]:

a = input('a=');
b = input('b=');
N = input('N=');

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

As you can see, r1 and r2 are already in vector form, so:

x = r1;
% or
x = r2;

For the last part (this will print duplicates as well):

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

Upvotes: 2

Related Questions