Repeating elements in a vector

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Erika
Erika 2012-10-10
How do I write a function with loops that takes a two column matrix and has the element of one column be repeated by the other column? For example,
A=
4 1
5 2
6 3
>>([4,1; 5,2; 6,3])
ans: 4 5 5 6 6 6
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Evan
Evan 2012-10-10
help repmat
You might find that function to be of use. Also, think about concatenation.
Jan
Jan 2012-10-10
Please do not post solutions of homework questions. On one hand the OP cannot submit this without cheating, on the other hand his teacher will not recommend this forum anymore. So the OP's and the forum's reputation suffer.

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回答（3 个）

Andrei Bobrov
Andrei Bobrov 2012-10-10
编辑：Andrei Bobrov 2012-10-11
for solution your problems you can use functions of MATLAB: cumsum; zeros.
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Jan
Jan 2012-10-10
Please do not post solutions of homewokr questions. On one hand the OP cannot submit this without cheating, on the other hand his teacher will not recommend this forum anymore. So the OP's and the forum's reputation suffer.
Biside this, your soultion is smart and efficient. +1

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Sean de Wolski
Sean de Wolski 2012-10-10
Evan
Evan 2012-10-10
function v = fname(A)
v = [];
for i = 1:size(A,1)
v = [v repmat(A(i,1),1,A(i,2))];
end
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Erika
Erika 2012-10-11
编辑：Erika 2012-10-11
I'm not trying to look for answers. I only wanted to know what embedded functions in MATLAB I can use because that's how I'll learn... I guess I should've phrased my question in a better way.
Jan
Jan 2012-10-12
@Erika: Question, especially from beginners, are very welcome in this forum. Asking a perfect question concerning homework problems is nearly impossible, because this requires a deep understanding of the question, which you reach usually after the problem is solved.
As long as the contributors of this forum answer homework question such general that the pupils/students perform the main part by their own, all kind of questions are welcome and useful.

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