how to sum value of fields on struct?

Question

fred bnm 2016-10-26

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回答： Karol Ondrejkovic 2023-3-28

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i have a struct in size 1000*1 with 2 fields.how to sum value of fields? my code:(s is struct)

sum1 = sum(s.Fields1(1:end));

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KSSV 2016-10-26

Did that work? You got any error?

fred bnm 2016-10-27

no but i cant obtain sum of values in the fields.

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Answer 1

KSSV 2016-10-26

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s = struct ;
for i = 1:100
    s(i).a = rand(1) ;
    s(i).b = i ;
end
suma = sum([s(:).a]) ;
sumb = sum([s(:).b]) ;

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khuat quanghuy 2018-9-19

thanks.

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Answer 2

Andrei Bobrov 2016-10-26

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编辑：Andrei Bobrov 2016-10-26

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z = struct2cell(s(:));
out = sum(reshape([z{:}],size(z)),2);

or general variant

z = cellfun(@(x)x(:)',struct2cell(s(:)),'un',0);
out = arrayfun(@(ii)sum([z{ii,:}]),(1:size(z,1))');

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Answer 3

sourav malla 2019-7-4

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You can do it with a for loop like this:

sum1=0;
for i=1:length(s)
    sum1=sum1+s(i).fieldname
end

or you can directly do like this:-

sum1=sum([s(:).fieldname])

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Answer 4

Karol Ondrejkovic 2023-3-28

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s = struct; % create a scalar (1-by-1) structure with no fields
N = 1000; % number of fields to be created
for i = 1 : N
    s(i).a = i + 1; % s(1).a = 2; s(2).a = 3; s(3).a = 4; ... ; s(N).a = 1001; (fill "a" fields with scalar values)
    s(i).b = i; % s(1).b = 1; s(2).b = 2; s(3).b = 3; ... ; s(N).b = 1000; (fill "b" fields with scalar values)
end
% Sumation of scalar values:
c = struct2cell(s); % convert (1 by N) struct to (2 by 1 by N) cell array 
ca_sum = sum([c{1,1,:}], 2); % sum of the elements in the "a" fields
cb_sum = sum([c{2,1,:}], 2); % sum of the elements in the "b" fields
c_sum = sum([c{:}]); % sum of the elements in the "a+b" fields