MATLAB: To order min to max value for matrix’s row

matrix

a=[0.412 0.322 0.300 0.112;0.222 0.05 0.350 0.555]
% I wanna order row's value min to max. like that;
a=[0.112 0.300 0.322 0.412;0.05 0.112 0.222 0.350 0.555]

Best Answer

 sortrows(sort(a,2))

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

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 =
    0.2599    0.5499    0.1839    0.3692    0.5752    0.6477    0.7802    0.8176
    0.8001    0.1450    0.2400    0.1112    0.0598    0.4509    0.0811    0.7948
    0.4314    0.8530    0.4173    0.7803    0.2348    0.5470    0.9294    0.6443
    0.9106    0.6221    0.0497    0.3897    0.3532    0.2963    0.7757    0.3786
    0.1818    0.3510    0.9027    0.2417    0.8212    0.7447    0.4868    0.8116
    0.2638    0.5132    0.9448    0.4039    0.0154    0.1890    0.4359    0.5328
    0.1455    0.4018    0.4909    0.0965    0.0430    0.6868    0.4468    0.3507
    0.1361    0.0760    0.4893    0.1320    0.1690    0.1835    0.3063    0.9390
    0.8693    0.2399    0.3377    0.9421    0.6491    0.3685    0.5085    0.8759
    0.5797    0.1233    0.9001    0.9561    0.7317    0.6256    0.5108    0.5502
>> sort_mat=sort(mat1)
sort_mat =
    0.1361    0.0760    0.0497    0.0965    0.0154    0.1835    0.0811    0.3507
    0.1455    0.1233    0.1839    0.1112    0.0430    0.1890    0.3063    0.3786
    0.1818    0.1450    0.2400    0.1320    0.0598    0.2963    0.4359    0.5328
    0.2599    0.2399    0.3377    0.2417    0.1690    0.3685    0.4468    0.5502
    0.2638    0.3510    0.4173    0.3692    0.2348    0.4509    0.4868    0.6443
    0.4314    0.4018    0.4893    0.3897    0.3532    0.5470    0.5085    0.7948
    0.5797    0.5132    0.4909    0.4039    0.5752    0.6256    0.5108    0.8116
    0.8001    0.5499    0.9001    0.7803    0.6491    0.6477    0.7757    0.8176
    0.8693    0.6221    0.9027    0.9421    0.7317    0.6868    0.7802    0.8759
    0.9106    0.8530    0.9448    0.9561    0.8212    0.7447    0.9294    0.9390
>> resul1=sort_mat(7:10,:)
resul1 =
    0.5797    0.5132    0.4909    0.4039    0.5752    0.6256    0.5108    0.8116
    0.8001    0.5499    0.9001    0.7803    0.6491    0.6477    0.7757    0.8176
    0.8693    0.6221    0.9027    0.9421    0.7317    0.6868    0.7802    0.8759
    0.9106    0.8530    0.9448    0.9561    0.8212    0.7447    0.9294    0.9390
>>

MATLAB: Could anyone help me how to display the top three highest values in each column and display the other values to be zero.

Getting the top 3 values of each column is trivial with maxk

top3 = maxk(A, 3, 1)

I don't see the point in having 0s below these values but if that's you really want, you can simply concatenate a zero matrix below that

top3padded = [mask(A, 3, 1); zeros(size(A, 1)-3, size(A, 2))]

Best Answer

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

MATLAB: Could anyone help me how to display the top three highest values in each column and display the other values to be zero.

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