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How to access column of double in struct array?

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Cícero Vicente
Cícero Vicente 2023-6-10
移动：VBBV 2023-6-13
Hi good people!
I have a shp file (coastlines.shp) and need to get the lat, long and date data that are in the x, y and date (multiple data points) columns in double format and turn them into matrix data. Every time I try to access, I can only get the data from the first line or specific line, I've tried several ways, but without success.
Could be help me?
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Stephen23
Stephen23 2023-6-10
编辑：Stephen23 2023-6-10
The MATLAB approach would be to use comma-separated lists:
https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html
https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them
But note that all of the X and Y vectors have different lengths: so far your indexing shows that you have not taken this into account. Before you start trying to join them all together, you need to decide how you want to concatenate vectors of different sizes together.
"How to access column of double in struct array?"
None of X and Y are columns vectors, so it seems there might be some confusion about sizes.
Cícero Vicente
Cícero Vicente 2023-6-10
Hi Stephen23
Exactly. That's another question: X, Y and date have different sizes in their vectors, I believe that's why I can't access them. I need a code or solution that accesses the vectors, with their different sizes, and turns them into arrays of columns or something similar. I tried with the 'getfiled' function and other ways, but without success.
Can you help me?

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Stephen23
Stephen23 2023-6-10
"...and turn them into matrix data"
"Can you help me?"
Download this:
https://www.mathworks.com/matlabcentral/fileexchange/22909-padcat
and then use it like this:
X = padcat(coast.X)
Y = padcat(coast.Y)
For the dates use a cell array:
D = {coast.date}
https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html
https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them
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Cícero Vicente
Cícero Vicente 2023-6-12
Stephen23,
Thank u for your help!
I managed to do what I wanted: "how to access column of double in struct array". Now I will work with the data. Thanks.

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VBBV
VBBV 2023-6-10
编辑：VBBV 2023-6-10 
x(i,:) = 
y(i,:) =
Date(i,:) = 
% rename date in output vector to Date as its already used in the struct

Use the above format as shown which uses the for loop index.

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