find the size of a structured array

89 views (last 30 days)
I have a structured array called 'Data' which is a 1x1 struct, within this structured array are Data.note1, Data.note2, Data.note3, Data.note4. How is it possible to find the number of fields in the structured array? Where if it was a cell you would use length(cell)! Doing this for the structured array returns 1 where it should be 4.
  1 Comment
Stephen23
Stephen23 on 13 Dec 2022
Edited: Stephen23 on 13 Dec 2022
"Doing this for the structured array returns 1 where it should be 4."
No, it should return 1 because you have a scalar structure, you even wrote this yourself: "I have a structured array called 'Data' which is a 1x1 struct". A 1x1 array is scalar, i.e. has only one element, regardless of its class:
In contrast a structure array with four elements has ... four elements:
S = struct('X',{1,2,3,4}) % 1x4, not 1x1
S = 1×4 struct array with fields:
X
length(S)
ans = 4
The size of a structure array is completely independent of how many fields it has.

Sign in to comment.

Accepted Answer

Jonathan Sullivan
Jonathan Sullivan on 9 Jan 2012
length(fieldnames(Data))

More Answers (0)

Categories

Find more on Structures in Help Center and File Exchange

Tags

Community Treasure Hunt

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

Start Hunting!