hello , i want to remove the repeated values in vector without using Unique function

1 次查看（过去 30 天）

显示更早的评论

Ashraf Hisham 2018-4-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/392022-hello-i-want-to-remove-the-repeated-values-in-vector-without-using-unique-function

评论： Walter Roberson 2018-4-1

if a = [1 1 2 2 3 3 1] i want the result to be a=[1 2 3] thanks

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Birdman 2018-4-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/392022-hello-i-want-to-remove-the-repeated-values-in-vector-without-using-unique-function#answer_313015

在 MATLAB Online 中打开

A = [1 1 2 2 3 3 1]
[val,idx]=sort(A)
idx=A(idx(1:end-1))==A(idx(2:end))
val(idx)=[] % take it as new A vector

4 个评论
显示 2更早的评论隐藏 2更早的评论

Ashraf Hisham 2018-4-1

actually the question of my exam needs to do with for loop :(

Walter Roberson 2018-4-1

Okay, suppose you are examining element 4 out of 7, and you need to delete it because it is the same as something earlier. So you x(4)=[] . Now x is length 6. But your for loop still goes to 7.

You need to use one of these techniques:

keep a record of which items are to be deleted and delete them all at the same time after you have done your loops; or
start at the end and move to the beginning so that when the array gets shorter that does not matter because you are only going to look at earlier elements. (You might need to adjust this strategy for your situation.)

请先登录，再进行评论。