How to do this function

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

[Jan]

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]

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.

Answer 1

[Sean de Wolski]

doc unique
doc ismember
doc setdiff
doc setxor
doc intersect

etc...

[Vito]

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]

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.

[Sean de Wolski]

http://www.mathworks.nl/matlabcentral/answers/38787

[Ryan]

To me the natural follow-up question is did you actually learn the approach to solve these problems?

[Vito]

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]

Thanks Matt for your answer i can use "for" loops and "if-else" statements!