使用matlab中的其他向量元素创建矩阵

Question

I have two vectors a, b

a=[1; 2; 3; 4]
b=[1; 2; 3] 

And I want to create a matrix which will look like this

c=[1 1; 2 1; 3 1; 4 1; 1 2; 2 2; 3 2; 4 2; 1 3; 2 3; 3 3; 4 3]

Answer 1

这是另一种方式！

c = [repmat(a,numel(b),1),sort(repmat(b,numel(a),1))]

Answer 2

I have a feeling that there is a much better way, still...

p1 = repmat(a,[numel(b),1]);
p2 =  imresize(b,[numel(a)*numel(b) 1],'nearest');
answer =  [p1 p2];

---

Found a better way:

 [A,B] = meshgrid(a,b);
 answer = [reshape(B,[],1) reshape(A,[],1)];

---

Chris Taylor suggests a more compact way:

 [A B]=meshgrid(a,b); [B(:) A(:)];