how to find zero value with find

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alize beemiel
alize beemiel on 1 Feb 2022
Commented: alize beemiel on 1 Feb 2022
BC =[0 0 0
0 1 0
0 0 0
0 0 1
1 1 1
0 0 1
0 0 0
0 1 0
0 0 0]
U=1-BC
f=find(U);
and f is
f =[1 2 3 4 6 7 8 9 10 12 13 15 16 18 19 20 21 25 26 27]
but I was confused because it's clear that the exact value is
and this is what I want to have
i_want=[1 2 3 4 6 7 8 9 10 11 16 17 19 20 21 22 24 25 26 27]
Can someone help me Where is my mistake?

Answers (3)

Image Analyst
Image Analyst on 1 Feb 2022
Try this. It will give you two vectors, rows and columns, which are the row and column location that the corresponding zero can be found at in the original matrix.
BC =[0 0 0
0 1 0
0 0 0
0 0 1
1 1 1
0 0 1
0 0 0
0 1 0
0 0 0];
[rows, columns] = find(BC == 0)
rows = 20×1
1 2 3 4 6 7 8 9 1 3
columns = 20×1
1 1 1 1 1 1 1 1 2 2
  3 Comments
alize beemiel
alize beemiel on 1 Feb 2022
thank you sir
very interesting all of this

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Turlough Hughes
Turlough Hughes on 1 Feb 2022
Try the following:
find(BC==0)
or
find(~BC)
  4 Comments
alize beemiel
alize beemiel on 1 Feb 2022
thank you too for your answering
all this informations are very helpfull
thanks very much

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Les Beckham
Les Beckham on 1 Feb 2022
Edited: Les Beckham on 1 Feb 2022
Matlab will index down the columns first. It appears that you want to go across the rows first.
So, just transpose the matrix.
BC =[0 0 0
0 1 0
0 0 0
0 0 1
1 1 1
0 0 1
0 0 0
0 1 0
0 0 0];
i_want = find(BC' == 0)'
i_want = 1×20
1 2 3 4 6 7 8 9 10 11 16 17 19 20 21 22 24 25 26 27
  2 Comments
alize beemiel
alize beemiel on 1 Feb 2022
oh
thank you very much
so easy ..
thanks very much
for all your helpfull

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