comparing the two column in MATLAB

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?

Answer 1

[madhan ravi]

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

[Sky Scrapper]

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]

A(:,1) == - A(:,2)% just put minus infront that’s it

[Sky Scrapper]

Thanks!

[madhan ravi]

Anytime :)

[Celestie Gladys]

@madhan ravi if i have to find the same colums in not just for 1st and 2nd colum but for the entire matrix ?