Return the number of rows of an array

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Riley
Riley el 25 de Mayo de 2021
Comentada: Riley el 25 de Mayo de 2021
Hi, I just started using Matlab and is confused on how to extract the row indices/ row numbers.
For example, I have a function A:
A = [10 20 30 40 50 60 70 80 90 100]
I wanted to extract the row which has elements less than 50 so it will give
B= [1 2 3 4] (from row 1 to 4)
May I know how to do this? Any help and advice is greatly appreciated
  1 comentario
Stephen23
Stephen23 el 25 de Mayo de 2021
You seem to have confused rows with columns:
Your example A has only one row and ten columns, whereas your example B has one row and five columns.

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Stephan
Stephan el 25 de Mayo de 2021
A = [10 20 30 40 50 60 70 80 90 100]
A = 1×10
10 20 30 40 50 60 70 80 90 100
B = A(A<50)
B = 1×4
10 20 30 40
  3 comentarios
Stephan
Stephan el 25 de Mayo de 2021
A = [10 20 30 40 50 60 70 80 90 100]
A = 1×10
10 20 30 40 50 60 70 80 90 100
[row, col] = find(A<50)
row = 1×4
1 1 1 1
col = 1×4
1 2 3 4
Riley
Riley el 25 de Mayo de 2021
Thanks, Stephen!

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Alex Alex
Alex Alex el 25 de Mayo de 2021
B=find(A<50)
  2 comentarios
Stephen23
Stephen23 el 25 de Mayo de 2021
Note that strictly this returns the linear indices, not row (or column) subscript indices.
Riley
Riley el 25 de Mayo de 2021
Thanks, Alex

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