How to sum the values of a fieldname of struct

Question

Chao Zhang 2021-7-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/881078-how-to-sum-the-values-of-a-fieldname-of-struct

评论： Image Analyst 2021-7-19

Hello! I have a struct 'STC_ORE', and I want to calculate the values of fieldname' ORE_TON', so I want a code, but there are some errors. Therefore, could you please give me some solutions to deal with it, thanks!

for ii = 1:size(rock_code,1)
if ~isempty(STC_ORE(ii).ORE_TON)
A=sum([STC_ORE(:).ORE_TON]);
end
end

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Answer 1

Image Analyst 2021-7-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/881078-how-to-sum-the-values-of-a-fieldname-of-struct#answer_749058

在 MATLAB Online 中打开

You need to add the sum onto the prior value of the sum:

theSum = 0; % Initialize
for ii = 1:size(rock_code,1)
	if ~isempty(STC_ORE(ii).ORE_TON)
		theSum =  theSum + sum([STC_ORE(:).ORE_TON]); % Add onto running total.
	end
end

If you need more help, or that doesn't work, attach STC_ORE in a .mat file.

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Chao Zhang 2021-7-18

theSum = theSum + sum([STC_ORE(ii).ORE_TON]) might works well

Image Analyst 2021-7-19

Yeah, but it's not a bad idea to check like you did. Sometimes doing math on null/empty or NaN values will throw an error or make the whole thing be NaN.

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