How to arrange rows of a matrix to get a specific column in order?
조회 수: 1 (최근 30일)
이전 댓글 표시
are there any built-in function for this, or I have to extract that column, order it, and arrange the matrix separately?
댓글 수: 1
RAGHAVENDRA
2015년 2월 25일
편집: Guillaume
2015년 2월 25일
You can do the following way:
let us say i want to sort X according to 5th column, then:
X=randi(5,[10 10]);% 10X10 random matrix with elements <= 5
[S,I]=sort(X(:,5),'ascend');
Y=X(I,:);
답변 (2개)
Jos (10584)
2015년 2월 25일
편집: Jos (10584)
2015년 2월 25일
Yes, there is! Take a look at SORTROWS
M = [1 2 3 ; 2 3 1 ; 3 1 2]
sortrows(M,2)
댓글 수: 3
Jos (10584)
2015년 2월 25일
Oh, I misunderstood. You only want to sort column 3, leaving the other columns as they are?
M(:,3) = sort(M(:,3))
Guillaume
2015년 2월 25일
Jos, you didn't misunderstand the question and your answer was actually correct. Raghavendra should actually have tested the posted code, which sorted the rows according to the second column.
To be very clear:
sortrows(M, cols)
sorts the rows of M according the columns defined in cols, so
sortrows(M, 3)
sorts the rows of M so that values in column 3 are ascending
sortrow(M, [3 -2])
sort the rows of M, first according to column 3 in ascending order. For identical values in column 3 it then uses column 2 in descending order.
RAGHAVENDRA
2015년 2월 25일
You can do the following way:
let us say i want to sort X according to 5th column, then:
X=randi(5,[10 10]);% 10X10 random matrix with elements <= 5
[S,I]=sort(X(:,5),'ascend');
Y=X(I,:);
댓글 수: 3
Guillaume
2015년 2월 25일
Raghavendra, as mentioned in another of your answer, please use the code formatting tool when you answer, so that it is easily readable.
It's not that hard, just add two spaces before writing the line of code, or select the code and click the {} Code button.
People answering questions should know how to use the forum tools.
참고 항목
카테고리
Help Center 및 File Exchange에서 Shifting and Sorting Matrices에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!