could anyone help me how to select four maximum values of each row in a matrix size(10,8)

Question

jaah navi 2019-5-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464602-could-anyone-help-me-how-to-select-four-maximum-values-of-each-row-in-a-matrix-size-10-8

评论： Walter Roberson 2019-5-29

采纳的回答： KALYAN ACHARJYA

I am having a matrix of size(10,8) (% 10 rows and 8 columns)

I want to select 4 maximum values from each row by having the result of matrix size(4,8)(%4 rows and 8 columns)

Could anyone please help me on this.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Walter Roberson 2019-5-29

This question does not describe what to do in the case of ties.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KALYAN ACHARJYA 2019-5-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464602-could-anyone-help-me-how-to-select-four-maximum-values-of-each-row-in-a-matrix-size-10-8#answer_377064

编辑：KALYAN ACHARJYA 2019-5-29

在 MATLAB Online 中打开

You can do it in multiple ways, let’s consider, the mat1 is matrix having size 10x8

sort_mat=sort(mat1);
result=sort_mat(7:end,:);

Another way as per @madhan ravi comment

sort_mat=sort(mat1,'descend');
result=sort_mat(1:4,:)

See example

>> mat1=rand(10,8)
mat1 =
2599    0.5499    0.1839    0.3692    0.5752    0.6477    0.7802    0.8176
8001    0.1450    0.2400    0.1112    0.0598    0.4509    0.0811    0.7948
4314    0.8530    0.4173    0.7803    0.2348    0.5470    0.9294    0.6443
9106    0.6221    0.0497    0.3897    0.3532    0.2963    0.7757    0.3786
1818    0.3510    0.9027    0.2417    0.8212    0.7447    0.4868    0.8116
2638    0.5132    0.9448    0.4039    0.0154    0.1890    0.4359    0.5328
1455    0.4018    0.4909    0.0965    0.0430    0.6868    0.4468    0.3507
1361    0.0760    0.4893    0.1320    0.1690    0.1835    0.3063    0.9390
8693    0.2399    0.3377    0.9421    0.6491    0.3685    0.5085    0.8759
5797    0.1233    0.9001    0.9561    0.7317    0.6256    0.5108    0.5502
>> sort_mat=sort(mat1)
sort_mat =
1361    0.0760    0.0497    0.0965    0.0154    0.1835    0.0811    0.3507
1455    0.1233    0.1839    0.1112    0.0430    0.1890    0.3063    0.3786
1818    0.1450    0.2400    0.1320    0.0598    0.2963    0.4359    0.5328
2599    0.2399    0.3377    0.2417    0.1690    0.3685    0.4468    0.5502
2638    0.3510    0.4173    0.3692    0.2348    0.4509    0.4868    0.6443
4314    0.4018    0.4893    0.3897    0.3532    0.5470    0.5085    0.7948
5797    0.5132    0.4909    0.4039    0.5752    0.6256    0.5108    0.8116
8001    0.5499    0.9001    0.7803    0.6491    0.6477    0.7757    0.8176
8693    0.6221    0.9027    0.9421    0.7317    0.6868    0.7802    0.8759
9106    0.8530    0.9448    0.9561    0.8212    0.7447    0.9294    0.9390
>> resul1=sort_mat(7:10,:)
resul1 =
5797    0.5132    0.4909    0.4039    0.5752    0.6256    0.5108    0.8116
8001    0.5499    0.9001    0.7803    0.6491    0.6477    0.7757    0.8176
8693    0.6221    0.9027    0.9421    0.7317    0.6868    0.7802    0.8759
9106    0.8530    0.9448    0.9561    0.8212    0.7447    0.9294    0.9390
>> 

3 个评论
显示 1更早的评论隐藏 1更早的评论

KALYAN ACHARJYA 2019-5-29

Yes, thanks answer added!

jaah navi 2019-5-29

thanks.

请先登录，再进行评论。

Answer 2

Guillaume 2019-5-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464602-could-anyone-help-me-how-to-select-four-maximum-values-of-each-row-in-a-matrix-size-10-8#answer_377078

编辑：Guillaume 2019-5-29

在 MATLAB Online 中打开

As I commented here (please don't ask the same question multiple times, thus wasting people's time), the simplest way in modern matlab (R2017b or later) is with maxk:

result = maxk(yourmatrix, 4)