Extracting data from struct as array

Hi, I have a following structure:

S(1).a = 1:10;

S(2).a = 11:20;

S(3).a = 21:30;

I want the output in the following format:

y = [1:10; 11:20; 21:30];

Using [S(1:3).a] concatenates it in a single direction. Is there a better way (other than for loop) to extract the data in the requisite format?

Thank you,

Rashi

Answer 1

[Stephen23]

S(1).a = 1:10; 
S(2).a = 11:20;
S(3).a = 21:30; 
M = vertcat(S.a)

M = 3x10

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or

M = cat(1,S.a)

M = 3x10

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https://www.mathworks.com/matlabcentral/discussions/tips/847976-tutorial-comma-separated-lists-and-how-to-use-them

Answer 2

[Ganesh]

Hi @Rashi Monga,

You can use "vertcat()" for using the same. Refer to the following code:

% Your structure
S(1).a = 1:10; 
S(2).a = 11:20;
S(3).a = 21:30;

% Extracting and concatenating
y = vertcat(S.a); % This works directly because of how MATLAB handles struct arrays
y

y = 3x10

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For more information on the function "vertcat()", refer to the following documentation:

https://www.mathworks.com/help/matlab/ref/double.vertcat.html

[Rashi Monga]

Hi everyone,

Thank you. It was very helpful.

[Ganesh]

% After using vertcat
y = y(:,1:5);