Why there is a difference between sortrows(A) and sortrows(A,1)?

Question

frankovaT 2020-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/540375-why-there-is-a-difference-between-sortrows-a-and-sortrows-a-1

回答： madhan ravi 2020-6-2

Hello all

I was wondering why there is difference between A=sortrows(A) and B=sortrows(A,1), denote that A is n by n matrix?

According to matlab documentation sortrows(A), sort the rows of a matrix in ascending order based on the elements in the first column. So I guess it should result in the same output as sortrows(A,1) which according to matlab, sorts A based on the columns specified in the vector column.

But when I look at the 5 first varaibles in A and B, I see different indexes.

index a=[7 10 17 35 41]

index b=[306 741 859 311 740]

What s happening?

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Answer 1

madhan ravi 2020-6-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/540375-why-there-is-a-difference-between-sortrows-a-and-sortrows-a-1#answer_444791

在 MATLAB Online 中打开

I get the same results?

>> Matrix
Matrix =
     1     1     4     2
     4     4     4     5
     2     2     3     1
     3     4     1     5
>> B = sortrows(A)
B =
     1     1     4     2
     2     2     3     1
     3     4     1     5
     4     4     4     5
>> C = sortrows(A,1)
C =
     1     1     4     2
     2     2     3     1
     3     4     1     5
     4     4     4     5
>> 