Access Field from Struct

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N/A
N/A 2020-9-25
编辑： Stephen23 2020-9-25
Hello everyone,
I need your help with accessing a field from a struct. I am not really familiar with how to use structs.
I got this struct (not mine, therefore I don't really know how to properly work with it) and just want to plot the values that are in the first column.
There is probably a really easy way how to do it. I tried to access the data with something like a=structname.MeansArea, but this gives me only the very first entry of the column. I apprechiate all help.
  1 个评论
Stephen23
Stephen23 2020-9-25
编辑：Stephen23 2020-9-25
Structure arrays have two independent features which need to be considered when accessing their data:
  • the size, which determines what indexing you can use.
  • the fields, which determines what field names you can use.
https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html
For non-scalar structures you will likely find comma-separated lists to be very useful:
https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html
https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists
It is also possible to access the fieldnames dynamically:
https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-9-25
编辑：Ameer Hamza 2020-9-25
You need to use concatenation brackets [ ]
a=[structname.MeansArea]
Read here: https://www.mathworks.com/help/matlab/ref/double.cat.html
  2 个评论
N/A
N/A 2020-9-25
Thanks for the fast and correct answer.
Ameer Hamza
Ameer Hamza 2020-9-25
I am glad to be of help!

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