How to do this function

2012 7 16
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Hi to all! I'm from Italy and i'm new to this forum! I need some help in writing this function in Matlab. I have to vectors X and Y. For example X=[1,2,0,2,1] and Y=[2,3,-1,0,1,0,0]. I consider two sets, S_X and S_Y, composed by the distinct elements of my two vectors. In the example S_X={0,1,2} and S_Y={-1,0,1,2,3}. Now, i need a function that have to have in input two vectors X and Y and in output a variable W defined like these:
W= -1 if S_X is contained in S_Y, but S_X and S_Y are different W= 1 if S_Y is contained in S_X, but S_X and S_Y are different W= 0 if S_X=S_Y W= Nan otherwise
Thanks a lot Bye Vito

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Jan
Jan 2012-7-16
Because this is a homework question, I recommend the standard procedure: Please post, what you have tried so far and which problems occurred. A forum should not solve your homework, otherwise your professor will not recommend this forum any longer.
Vito
Vito 2012-7-16
编辑：Vito 2012-7-16
Thanks Jan Simon for the answer. I had not posted my "solution" just becouse it is so short and not really complete. I've just thinked to do
m==size(x) n==size(y) for i=1:m for j=1:n if x(i)!=x(j)....S_x={...}
else S_y={...}
After i really don't know how to write it better in Matlab and how to continue this solution.
Hope you understand me.
Bye Vito.

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回答（1 个）

Sean de Wolski
Sean de Wolski 2012-7-16

1 个投票

doc unique
doc ismember
doc setdiff
doc setxor
doc intersect
etc...

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Vito
Vito 2012-7-16
Thanks for the answer Sean de Wolski, but my professors don't want i'm gonna use this "pre-definined" function. I think they want to show them i've learned the approach to solve these problems. There is another way more explicative to solve my problem? Thanks a lot Vito
Matt Kindig
Matt Kindig 2012-7-16
Well the natural follow-up questions is what built-in functions can you use? Can you use "find"? "for" loops? "if-else" statements? "sort"?. You can do what you want to do using those functions.
Ryan
Ryan 2012-7-16
To me the natural follow-up question is did you actually learn the approach to solve these problems?
Vito
Vito 2012-7-16
Thanks for your answer Ryan. The course my professor have done was for me so incompolete and i'm not actually in condition to solve this problems. I just hope i'll find an help in this forum. Bye Vito
Vito
Vito 2012-7-16
Thanks Matt for your answer i can use "for" loops and "if-else" statements!

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Vito
Vito
2012-7-16

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