You can make append two columns like this:
a=rand(10,1);
b=rand(10,1);
c=[a b];
size(c)
or like this:
c=cat(2,a,b);
size(c)
Both approaches extend to n columns:
a=rand(10,1);
b=rand(10,1);
c=rand(10,1);
d=rand(10,1);
M1=[a b c d];
size(M1)
M2=cat(2,a,b,c,d);
size(M2)
Alternatively, you could initialize a matrix and then fill it with the columns:
M3=nan(numel(a),4); % you don't really need to initialize, but it is wise
M3(:,1) = a;
M3(:,2) = b;
M3(:,3) = c;
M3(:,4) = d;
size(M3)
