Select values in one column based on entries in another column
48 次查看(过去 30 天)
显示 更早的评论
Hi.
I looking for a way to read values in one column based on the entries in qnother column,
For example in the attached array A, the first entry in the first column is -3.14, here I would like to read all the correponding entries in the third column whichever got -3.14 in the first column..
0 个评论
采纳的回答
更多回答(1 个)
Arthur Reis
2022-2-21
编辑:Arthur Reis
2022-2-21
You can use a logical mask. For example (using two vectors, but it is easily adaptable for your case with arrays with many columns):
A = [1; 2; 3; -3.14; 4; -3.14];
A =
1.0000
2.0000
3.0000
-3.1400
4.0000
-3.1400
>> A_mask = (A==-3.14) % also works with <, >, >=, <=.....
A_mask =
6×1 logical array
0
0
0
1
0
1
>> B = ['a'; 'b'; 'c'; 'd'; 'e'; 'f']
B =
6×1 char array
'a'
'b'
'c'
'd'
'e'
'f'
>> B(A_mask) %passing a logical array as indexes will return every 'true' element
ans =
2×1 char array
'd'
'f'
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!