comparing the two column in MATLAB

2018 11 22
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更新时间：2023 1 26
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Hello!
Let, A=[ 1 2 ; 2 2; 3 4; 4 4]
I want to compare the 1st column with the 2nd column to find out if there is any row having the same values in both columns.
Say, in the example, 2nd and 4th rows have the same values in both the two columns. i need to find the rows where the condition is satisfied.
Could you please help me?

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madhan ravi
madhan ravi 2018-11-22
编辑：madhan ravi 2018-11-22

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rowswithidenticalvalues=find(A(:,1)==A(:,2)) %1 indicates the values are the same

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Sky Scrapper
Sky Scrapper 2018-11-22
编辑：Sky Scrapper 2018-11-22
That's working. Thanks.
another question:
I want to check if , value of column 1= - ( value of column 2)
as for example, A[ 1 2; 10 -10],
then how to write the code to compare the two columns?
madhan ravi
madhan ravi 2018-11-22
A(:,1) == - A(:,2)% just put minus infront that’s it
Celestie Gladys
Celestie Gladys 2023-1-26
@madhan ravi if i have to find the same colums in not just for 1st and 2nd colum but for the entire matrix ?

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