# Can you create a matrix using a for loop

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Maryal on 9 Dec 2017
Commented: Lam Nguyen Van on 11 Mar 2020
Is possible to create a matrix by just using for loops Thanks
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Stephen23 on 9 Dec 2017
"Is possible to create a matrix by just using for loops"
Yes.

Amy on 11 Dec 2017
Look at the first example in the documentation for 'for': https://www.mathworks.com/help/matlab/ref/for.html

Lam Nguyen Van on 10 Mar 2020
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);]
Lam Nguyen Van on 11 Mar 2020
I did it. I used for loop and function.
phi=[30, 45, 90];
n=length(phi);
[e]=xuat_vecto(phi1);
A=zeros(n,3);
for i=1:n
[d]= xuat_vecto (phi(i));
A(i,:)=[d];
end
A
function [e]=xuat_vecto(alpha)
[a, b, c]=ham_luong_giac (alpha);
e=[a, b, c];
end
function [a1, a2, a3] = ham_luong_giac (phi)
a1=sin(phi);
a2=cos(phi);
a3=sin(phi)*cos(phi);
xuat= [a1, a2, a3];
end