How could I write in a vector something in a position different to a given one?

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Juan Manuel Hussein Belda 2021-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/1564481-how-could-i-write-in-a-vector-something-in-a-position-different-to-a-given-one

评论： Juan Manuel Hussein Belda 2021-10-15

采纳的回答： KSSV

v = [1,2,3,4,5]

idx = 3;

What I would like to do is get v = [NaN, NaN, 3, NaN, NaN];

How could I do it?

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Answer 1

KSSV 2021-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/1564481-how-could-i-write-in-a-vector-something-in-a-position-different-to-a-given-one#answer_809256

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v = [1,2,3,4,5];
idx = 3;
iwant = NaN(size(v)) ;
iwant(idx) = v(idx)

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Juan Manuel Hussein Belda 2021-10-15

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Thank you so much for the reply!! However, I think I tried to simplify the question and ended up asking it wrong. I will ask again, and sorry for the inconvenience!!

I have two vectors, see:

result = [7,5,6,4,0];
v_sample = [1,3,4,0,0];
v_real = [1,2,3,4,5];

What I would like is to obtain the following:

v_sample_new = [1, NaN, 3, 4, Nan]
result_new = [7, NaN, 5, 6, NaN]

So, basically, v_sample_new is ordered with respect to v_real, and result has the correspondant values ( result(i) is related to v_sample(i) ) in a manner that is consistent as shown. I do noy know if I have explained it properly but I hope so, and thank you so much again!

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