How to find unique elements in a vector without using unique or find?
显示 更早的评论
I have A=randi(100,1,100); How can I find unique values in array and show them without using unique() and find() .
5 个评论
Walter Roberson
2016-10-23
The question was about how to find unique elements in a vector without using unique() or one other standard call (find?)
Massimo Zanetti
2016-10-24
Yes, maybe "trackable" homeworks?? :)
Jan
2016-10-24
At least the OP mentioned, that he is sorry about the deleting.
John D'Errico
2016-10-24
Yes. It CAN be done using basic MATLAB statements.
For example, using sort, then diff and find will make it absolutely trivial. And if you cannot use unique, then sort, diff and find are off limits too.
But this is homework. You need to do your homework. There is simply no reason for this question under any other circumstances. It was assigned to you, for you to learn. If we doit for you then you learn nothing but how to get others to do your work.
Rena Berman
2017-1-20
编辑：Image Analyst
2017-12-11
(Answers Dev) Restored Question.
I have
A=randi(100,1,100);
How can I find unique values in array and show them without using unique() and find() .
采纳的回答
Massimo Zanetti
2016-10-23
编辑：Massimo Zanetti
2016-10-23
Use an histogram based approach (works only for positive integers)
%get M random numbers from 1 to N
M=10; N=25;
A=randi(N,1,M)
%find unique values
x=1:N;
unique_vals = x(logical(accumarray(A',1,[N,1])))
更多回答（1 个）
You can do this with for and if:
suppose you have the numbers in x
and want to generate the unique numbers in xu
pick the first number of x, this is your first unique number in xu
now run through all the number in x
check if it is in xu
if so, proceed with the next number of x
else, add the number to your unique numbers x
Voilá
This is a possible algorithm, and it is up to you to implement it, to learn something.
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