How can I compare row by row to get rid if reciprocols and get corresponding indices

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Lei
Lei on 29 Oct 2012
hello, I have a data matrix looks like below.
A=[4 5 0 0 0 10 0 15 0 0.19218
4 5 0 0 0 15 0 20 0 0.06548
4 5 0 0 0 20 0 25 0 0.02662
4 5 0 0 0 25 0 30 0 0.01446
4 5 0 0 0 30 0 35 0 0.00708
4 5 0 0 0 35 0 40 0 0.00487
4 15 0 10 0 20 0 25 0 0.31673
4 15 0 10 0 25 0 30 0 0.09447
4 15 0 10 0 30 0 35 0 0.03430
4 15 0 10 0 35 0 40 0 0.02008
4 15 0 10 0 40 0 45 0 0.01002
4 15 0 10 0 45 0 50 0 0.00502
4 15 0 10 0 50 0 5 0 0.33494
4 10 0 15 0 5 0 0 0 0.19150
4 20 0 15 0 25 0 30 0 0.43342
4 20 0 15 0 30 0 35 0 0.10293
4 20 0 15 0 35 0 40 0 0.04998
4 20 0 15 0 40 0 45 0 0.02261
4 20 0 15 0 45 0 50 0 0.01038
4 20 0 15 0 50 0 55 0 0.00523
4 20 0 15 0 55 0 10 0 0.54030
4 15 0 20 0 10 0 5 0 0.37795
4 15 0 20 0 5 0 0 0 0.06513
];
Basically,I want compare row by row based on column [ 2 4 6 8]. for example,first row column 2,4, 6,8 is 5,0,10,15. and the 14th row column 2,4,6,8 is 10,15,5,0. In this case, I need the index of the two rows since I only want one row. For a second example,please compare 2nd and 15th row,2nd row has 5,0,15,20 and 15th row has 15,20,5,0. This is just part of my data, I have many reciprocol measurements which is roughly the same as I showed above.If anyone knows how can I solve this problem,please let me know. I do not want change the order of my data. Thanks

Accepted Answer

Sean de Wolski
Sean de Wolski on 29 Oct 2012
Look at using the various outputs from unique().
doc unique
  3 Comments
Lei
Lei on 29 Oct 2012
Hello Sean, Basically, I want compare this:
A=[ 5 0 10 15 0.021
5 0 15 20 0.011
10 15 5 0 0.022
15 20 5 0 0.009]
I need to compare first two columns of each row with the 3rd and 4th columns of all of the other rows.If the answer is true, I want the index of the two rows. So for this matrix, the comparison of row 1 and row 3 is true, same as row 2 and row 4,of coure, I need the index for both rows. But the other combinations, the comparisons are wrong.

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