Return the number of rows of an array

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Riley
Riley 2021-5-25
评论： Riley 2021-5-25
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 个评论
Stephen23
Stephen23 2021-5-25
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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采纳的回答

Stephan
Stephan 2021-5-25
Ran in:
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 个评论
显示 1更早的评论
Stephan
Stephan 2021-5-25
Ran in:
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

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更多回答（1 个）

Alex Alex
Alex Alex 2021-5-25
B=find(A<50)
  2 个评论
Stephen23
Stephen23 2021-5-25
Note that strictly this returns the linear indices, not row (or column) subscript indices.

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