Deleting fields of a particular dimension in a structure

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Anwesh Saha
Anwesh Saha 2023-1-25
评论： Stephen23 2023-1-26
I have a struct with ints in it. I want to delete the fields with 1X13 int32 in it. Also, I would like to know the count of different fields with respect to its dimension. For example:- 120 fields with dimension int 1X12800.

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Stephen23
Stephen23 2023-1-25
编辑：Stephen23 2023-1-25
Ran in:
As I wrote in several of your earlier questions, this task would be much easier if your data were better designed:
https://www.mathworks.com/matlabcentral/answers/1898095-how-to-convert-fields-in-a-struct-into-an-int#answer_1153315
But lets try your preferred complex aproach. First some fake data:
S = struct('A',rand(1,12800),'B',rand(1,13),'C',rand(1,12800),'D',rand(1,13),'E',rand(1,23))
S = struct with fields:
A: [0.5803 0.2030 0.0122 0.9301 0.2433 0.3086 0.5901 0.1738 0.2942 0.0230 0.2622 0.0181 0.6488 0.0865 0.4528 0.4397 0.0823 0.7363 0.9030 0.4084 0.7442 0.4275 0.0978 0.9522 0.1738 0.4499 0.6503 0.8244 0.2360 0.6347 0.3943 0.5161 0.6434 0.0138 … ] B: [0.4005 0.7590 0.7921 0.4481 0.9009 0.8044 0.1968 0.7716 0.7309 0.0090 0.3974 0.1231 0.9473] C: [0.2528 0.5823 0.9105 0.8959 0.0374 0.8646 0.0330 0.5280 0.3386 0.3714 0.1557 0.2200 0.6784 0.7183 0.4370 0.4224 0.4348 0.1134 0.5370 0.8962 0.8624 0.1554 0.7767 0.7557 0.4659 0.2342 0.5080 0.4323 0.5891 0.3560 0.6953 0.8060 0.4946 0.2856 … ] D: [0.7431 0.2480 0.7271 0.0565 0.2234 0.4784 0.9350 0.3833 0.0551 0.1141 0.2919 0.9120 0.3175] E: [0.1765 0.3280 0.1030 0.4814 0.7136 0.0351 0.0152 0.6603 0.1930 0.6685 0.5606 0.6725 0.1345 0.1871 0.0278 0.1757 0.0406 0.1327 0.3057 0.6876 0.0991 0.7010 0.1206]
C = struct2cell(S);
F = @(a)isequal(size(a),[1,13]);
X = cellfun(F,C,'uni',1);
B = fieldnames(S);
Z = cell2struct(C(~X),B(~X),1)
Z = struct with fields:
A: [0.5803 0.2030 0.0122 0.9301 0.2433 0.3086 0.5901 0.1738 0.2942 0.0230 0.2622 0.0181 0.6488 0.0865 0.4528 0.4397 0.0823 0.7363 0.9030 0.4084 0.7442 0.4275 0.0978 0.9522 0.1738 0.4499 0.6503 0.8244 0.2360 0.6347 0.3943 0.5161 0.6434 0.0138 … ] C: [0.2528 0.5823 0.9105 0.8959 0.0374 0.8646 0.0330 0.5280 0.3386 0.3714 0.1557 0.2200 0.6784 0.7183 0.4370 0.4224 0.4348 0.1134 0.5370 0.8962 0.8624 0.1554 0.7767 0.7557 0.4659 0.2342 0.5080 0.4323 0.5891 0.3560 0.6953 0.8060 0.4946 0.2856 … ] E: [0.1765 0.3280 0.1030 0.4814 0.7136 0.0351 0.0152 0.6603 0.1930 0.6685 0.5606 0.6725 0.1345 0.1871 0.0278 0.1757 0.0406 0.1327 0.3057 0.6876 0.0991 0.7010 0.1206]
This would be much easier using some kind of indexed array class, rather than forcing pseudo-indices into fieldnames.
"For example:- 120 fields with dimension int 1X12800."
V = cellfun(@(a)size(a,2),C);
U = unique(V)
U = 3×1
13 23 12800
N = histcounts(V,[U;Inf])
N = 1×3
2 1 2
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Stephen23
Stephen23 2023-1-26
"When I run the command given in the previous answers by you, I run into the following error:"
I cannot debug code that you do not show here.
Providing the complete error message is also a requirement, if you want further help.
"How do I delete say the fields with dimensions 1X13?"
That is what my answer does. Take a look at my answer.

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