How to programmatically modify substructure with arbitrary number of levels?

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Simon Fortin-Deschenes
评论： Simon Fortin-Deschenes 2022-4-13
I am trying to create a function that can modify a field in an arbitrary deep structure in the following way:
function modified_struct = modify_field(original_struct, field_name_cell_aray, new_value)
For instance if I have an original_struct such that
original_struct.a.b = 1
calling
modified_struct = modify_field(original_struct, {'a', 'b'}, 2)
would create the following operations
modified_struct = original_struct
modified_struct.(a).(b) = 2
This should work for a struct with an arbitrary number of levels:
modified_struct = modify_field(original_struct, {'a', 'b', 'c', 'd'}, new_value)
I want a solution that does not use the eval() command since I need to use this in a parfor loop.
Is this possible in matlab?

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采纳的回答

Stephen23
Stephen23 2022-4-13
编辑：Stephen23 2022-4-13
Ran in:
I would not write a function for this, just use SETFIELD with a comma-separated list:
S.a.b = 1;
C = {'a','b'};
N = 2;
S = setfield(S, C{:}, N);
Checking:
S.a.b
ans = 2
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

更多回答（1 个）

Jean-Baptiste Lanfrey
If I understand correctly, all you need is to use the setfield command, for example:
modified_struct = setfield(original_struct, 'a', 'b', 2)
The field arguments are not in a cell array but I guess it is easy enough to accomodate for this.

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