How to insert a new vector to matrix in every iteration?
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skinny pete
on 18 May 2019
Commented: Sulaymon Eshkabilov
on 18 May 2019
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?
0 Comments
Accepted Answer
madhan ravi
on 18 May 2019
Edited: madhan ravi
on 18 May 2019
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
3 Comments
madhan ravi
on 18 May 2019
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.
More Answers (1)
Sulaymon Eshkabilov
on 18 May 2019
Edited: Sulaymon Eshkabilov
on 18 May 2019
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 Comments
madhan ravi
on 18 May 2019
Edited: madhan ravi
on 18 May 2019
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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