Creating Matrix using nested for loop?

how would i create the following matrix using a nested for loop?

[3 6 9 12 15;
4 8 12 16 20;
7 14 21 28 35] 
so far i have: m=3;
n=5;
C=zeros(m,n);
for j=1:n
  for i=1:m
 C(i,j) = 
  end
end

[Azzi Abdelmalek]

For the first column, why 3, 4 then 7 ?

[Sima]

its a question that practices making certain matrices using a nested for loop and the answer has to contain a nested for loop

Answer 1

[Azzi Abdelmalek]

Maybe you want this

n=5;
m=6;
out=cell2mat(arrayfun(@(x) x:x:n*x,(1:m)','un',0))

Answer 2

[Roger Stafford]

How about

 C = [3;4;7]*(1:5);

or

 C = zeros(3,5);
 for r = [3,4,7]
   for c = 1:5
     C(r,c) = r*c;
   end
 end

[Alberto]

m=3; n=5; C=zeros(m,n); A=[3 4 7]; for k=1:length(A) for j=1:5 C(k,j)= A(k)*j end end

Answer 3

[Lam Nguyen Van]

Hi,

I want to creat matrices automatically with for loop in Matlab?

phi1=30; phi2=45; phi3=90;

After running the code I want to have a matric A with the following elements:

A=[sin(phi1) cos(phi1) sin(phi1)*cos(phi1);

sin(phi2) cos(phi2) sin(phi2)*cos(phi2);

sin(phi3) cos(phi3) sin(phi3)*cos(phi3);]

Thanks.