Finding min values of third column for rows with similar values

2 ビュー (過去 30 日間)

Hi,
I have a Table
2.0000 0 3.1971
1.0000 0 3.1971
3.0000 0 6.4662
1.0000 0 6.4662
3.0000 0 9.6356
2.0000 0 9.6356
2.0000 1 7
1.0000 1 5
3.0000 1 6
1.0000 1 10
3.0000 1 44
2.0000 1 12
Now, what I want is that find minimum value of third column for the first column with equal value in each loop of second column.
Maybe it is better to see the result what I mean.
2.0000 0 3.1971
1.0000 0 3.1971
3.0000 0 6.4662
2.0000 1 7
1.0000 1 5
3.0000 1 6
Really appreciate

1 件のコメント

Stephen Cobeldick 2020 年 8 月 11 日
The example is not clear for me. You wrote that you want the "...minimum value of third column...", can you please explain why your example output contains this row:
...
2.0000 1 7
...
when the input matrix contains both of these rows
...
2.00000 1.00000 7.00000
...
2.00000 1.00000 2.00000
As far as I can tell, 2 is less than 7, so why does the expected output not contain the "minimum value" ?

サインインしてコメントする。

採用された回答

Stephen Cobeldick 2020 年 8 月 11 日

>> M = [2.0000,0,3.1971;1.0000,0,3.1971;3.0000,0,6.4662;1.0000,0,6.4662;3.0000,0,9.6356;2.0000,0,9.6356;2.0000,1,7;1.0000,1,5;3.0000,1,6;1.0000,1,10;3.0000,1,44;2.0000,1,2]
M =
2.0000 0 3.1971
1.0000 0 3.1971
3.0000 0 6.4662
1.0000 0 6.4662
3.0000 0 9.6356
2.0000 0 9.6356
2.0000 1.0000 7.0000
1.0000 1.0000 5.0000
3.0000 1.0000 6.0000
1.0000 1.0000 10.0000
3.0000 1.0000 44.0000
2.0000 1.0000 2.0000
>> [U,X,Y] = unique(M(:,1:2),'stable','rows');
>> V = accumarray(Y,M(:,3),size(X),@min);
>> A = [U,V]
A =
2.0000 0 3.1971
1.0000 0 3.1971
3.0000 0 6.4662
2.0000 1.0000 2.0000
1.0000 1.0000 5.0000
3.0000 1.0000 6.0000

1 件のコメント

Thats great. I spent like 5 hours to reach a very bad coding. But, you saved me
Thanks,

サインインしてコメントする。

その他の回答 (1 件)

Sudheer Bhimireddy 2020 年 8 月 11 日
If the order is not important, look at sort function.

サインインしてコメントする。

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by