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Easy columns merge question

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012786534
012786534 2016-6-6
编辑： Image Analyst 2016-6-7
Hi all, I have an easy merge question.Let's say I have 2 columns that look like this: A = [1 NaN 3 NaN 5 6 ...] and B = [NaN 2 NaN 4 5 6 ...]. Now, I want to merge them so I get C = [1 2 3 4 5 6 ...]. Any ideas? Thanks all!

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2016-6-6
编辑：Azzi Abdelmalek 2016-6-6
A = [1 NaN 3 NaN 5 6]
B= [NaN 2 NaN 4 5 6]
C=unique([A B])
C(isnan(C))=[]
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Azzi Abdelmalek
Azzi Abdelmalek 2016-6-6
Your original question is different. Please edit your question
Azzi Abdelmalek
Azzi Abdelmalek 2016-6-6
A = [1 NaN NaN 4 5 NaN],
B = [1 2 NaN NaN 5 NaN]
i1=isnan(A)
i2=~isnan(B)
C=A
C(i1&i2)=B(i1&i2)

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Image Analyst
Image Analyst 2016-6-6
Try this:
C = A; % Initialize
% Replace any nan's with B
C(isnan(C)) = B(isnan(C))
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012786534
012786534 2016-6-6
Yes, the numbers may be the same. If so, C take the value of A
Image Analyst
Image Analyst 2016-6-7
编辑：Image Analyst 2016-6-7
Then my code works.
It works even if you meant "Yes, the numbers may be different. If so, C take the value of A"
If you wanted B numbers in preference to A, then initialize to B instead of A.
A = [1 NaN NaN 4 5 NaN]
B = [1 2 NaN NaN 5 NaN]
C = A; % Initialize
% Replace any nan's with B
C(isnan(C)) = B(isnan(C))
C =
1 2 NaN 4 5 NaN

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