how to extract data from structure efficiently

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Hi
I have this structure with sometimes allot of A_scans:
>> Data.CH1
ans =
name: 'CH1'
Props: [1x1 struct]
A_scan1_1: [1x1 struct]
A_scan1_2: [1x1 struct]
A_scan1_3: [1x1 struct]
A_scan1_4: [1x1 struct]
A_scan1_5: [1x1 struct]
...
Where ecach scans has a "data" variable, that I want to put in a matrix row by row:
Data.CH1.A_scan1_1
ans =
name: 'A_scan1_1'
Props: [1x1 struct]
data: [1x31990 int16]
What is the most efficient way of extracting the "data" arrays into a matrix? I guess i could do a forloop but I have a feeling there might be a faster way?
  2 Comments
Stephen23
Stephen23 on 13 Apr 2016
Edited: Stephen23 on 13 Apr 2016
It really depends on what you are doing:
  • if you are generating the structure Data, then you should follow Walter Roberson's suggestion and use a non-scalar structure to store the data. This would be the optimal solution, and it would be trivial to access the data inside the structure.
  • if Data is being provided to you then unfortunately this not a very convenient format to process without loops: even if it could be possible without a loop, a loop may well be the clearest code.

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Answers (1)

Walter Roberson
Walter Roberson on 13 Apr 2016
The more efficient way to extract it efficiently is to use a single A_scan1 that is indexed -- a struct array. Then you could do something like horzcat(A_scan1.data)

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