Access Field from Struct

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.

[Stephen23]

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

Answer 1

[Ameer Hamza]

You need to use concatenation brackets [ ]

a=[structname.MeansArea]

Read here: https://www.mathworks.com/help/matlab/ref/double.cat.html

[Philipp Heinirch]

Thanks for the fast and correct answer.

[Ameer Hamza]

I am glad to be of help!