Mutual array between matrixes ( complete )

Question

alexaa1989 2014-8-11

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评论： alexaa1989 2014-8-15

Thank you all for your previous answers however it seems that I could not resolve the problem so I decided to explain it in more details hope someone can help

I have 3 matrixes: x1=[8,4,2, 1,7,3 ,5,6] x2=[4,3,5, 7,6,2 ,1,8] o=[8,1,3,5,2,6,4,7]

I generate two other matrixes as follow using x1 and x2 and o y1=[5,2,8, 1,7,3 ,6,4] y2=[8,1,3, 7,6,2 ,5,4]

here is how y1 and y2 are produced: for the middle section of y1 and y2 I used exactly the same part in x1 and x2 that are pointed with Bold after that for the parts in the right side of Bold I use parts of (o)that are not appeared in y1 and y2 so far

for the left side of Bold I use all arrays from x2 that are not still used in y1 and same for x1 and y2 I have coded some of it as follow

x1=[8,4,2,1,7,3,5,6]

x2=[4,3,5,7,6,2,1,8]

o=[8,1,3,5,2,6,4,7]

c1=3;

c2=6;

y1=[ V1 x1(c1+1:c2) V2 ]

y2=[ V3 x2(c1+1:c2) V4 ]

I need to define V1 V2 V3 V4

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Joseph Cheng 2014-8-11

编辑：Joseph Cheng 2014-8-11

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in your direct message you wrote

v1 v2 v3 v4 are the codes to define what I have been wanting 
of course if you can code the program in a different way I would be happy to use it

my comment is can you supply what they should be manually so i can better understand your conditions.

alexaa1989 2014-8-11

My apologies, I misundrestood.

V1=[8,4,2]

x1(c1+1:c2)=[1,7,3]

V2=[5,6]

V3=[4,3,5]

x2(c1+1:c2)=[7,6,2]

V4=[1,8]

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Answer 1

Christopher Berry 2014-8-14

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https://ww2.mathworks.cn/matlabcentral/answers/147167-mutual-array-between-matrixes-complete#answer_148661

I think that your algorithm description and examples values are contradictory, so its hard to answer this exactly. But, I will suggest you look at the function setdiff. This will let you find the elements of one set that are not present in another set. See the documentation below

http://www.mathworks.com/help/matlab/ref/setdiff.html

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alexaa1989 2014-8-15

thank you for your response but I have written it successfully

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Answer 2

Roger Stafford 2014-8-14

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Christopher is right. The function you need is 'setdiff' using the 'stable' option.

 n = length(x1);
 y1 = x1((c1+1):c2);
 v2 = setdiff(o,y1,'stable');
 v2 = v2(end-n+c2+1:end);
 y2 = x2((c1+1):c2);
 v4 = setdiff(o,y2,'stable');
 v4 = v4(end-n+c2+1:end);
 v1 = setdiff(x2,[y1,v2],'stable');
 v3 = setdiff(x1,[y2,v4],'stable');
 y1 = [v1,y1,v2];
 y2 = [v3,y2,v4];

As Christopher pointed out, you contradicted yourself in your comment, Alexaa1989. The v's there are different from those in the original problem statement. I have assumed that the original statement is the correct one.