How to insert a new vector to matrix in every iteration?

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skinny pete
skinny pete 2019-5-18
评论： Sulaymon Eshkabilov 2019-5-18
Hi everyone,
I try to form a matrix that gets the vector elements by using for loop. In other words, I want to save the for loop result in a matrix. You can see my code below and what I want.
for x=1:1:3
for y=4:1:5
z = [x y]'
????
end
end
out =
1 1 2 2 3 3
4 5 4 5 4 5
Could you help me about this 2x6 matrix, please?

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采纳的回答

madhan ravi
madhan ravi 2019-5-18
编辑：madhan ravi 2019-5-18
Trivially done without a loop:
out = [repelem(x,1:numel(x));repmat(y,1,numel(x))]
With loop:
x=1:3;
y=4:5;
ctr=1;
out=zeros(2,numel(x)+numel(y)); % preallocate!
for k=1:numel(x)
for l=1:numel(y)
out(:,ctr) = [x(k) ; y(l)];
ctr=ctr+1;
end
end
Gives:
>> out
out =
1 1 2 2 3 3
4 5 4 5 4 5
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madhan ravi
madhan ravi 2019-5-18
No I don’t and I don’t see how that’s related to the question you originally asked. You'd be better off posting a new question.

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更多回答（1 个）

Sulaymon Eshkabilov
编辑：Sulaymon Eshkabilov 2019-5-18
This one works:
x = [1 1 2 2 3 3];
y= [4 5 4 5 4 5];
z = zeros(2, numel(x));
for ii=1:numel(x)
z(:,ii)=[x(ii), y(ii)];
end
  4 个评论
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madhan ravi
madhan ravi 2019-5-18
编辑：madhan ravi 2019-5-18
I just pointed out the fault which was there and there is no need to get angry with the fact being exposed. If it’s hard just ignore else try to accept the mistake and change it.

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