Create a new struct array from values of old struct array satisfying condition

Hi there,

I was wondering if there's a way to create a new struct array from an old struct array containing only the structs whose field values satisfy a certain condition. In my case, I have a 1 x 48 struct array (struct_out) with various fields, one of which is called 'condition' and contains a string use to identify the data stored in that particular struct (ex. struct_out(2).condition = "experiment03_2021_flag"). I would like to create a new struct array (new_struct) that contains only the structs from struct_out whose condition's have the substring 'flag' contained within them. I've been trying the following:

new_struct = struct_out(contains([struct_out.condition],"flag")')

but new_struct ends up being only a single, 1x1 struct rather than a whole array of structs as I'd like. Any ideas? I've already double checked that more than one struct indeed contains the substring "flag" in it's condition.

Thanks!

Answer 1

[Akshit Bagde]

Hi!

You are creating a 'char' array while using [struct_out.condition], and hence ending up getting only one logical output instead of an index array.

Create a cell array and do the same thing. It should work -

idx = contains({struct_out.condition},'flag');
new_struct = struct_out(idx);

% Or directly
new_struct = struct_out(contains({struct_out.condition},'flag'));