For loop doesn't doesn't summate

Question

GG 2021-11-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1597929-for-loop-doesn-t-doesn-t-summate

编辑： Image Analyst 2021-11-28

Month and data are imported tables. n==1 means that it is January, the purpose is to add to "number" with a value corresponding to the month but when I run I still get number=0. What is wrong with this code?

number=0;
for n=Month
        if n==1
            number=number+data(n);
        end 
end 

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Answer 1

Image Analyst 2021-11-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1597929-for-loop-doesn-t-doesn-t-summate#answer_842359

编辑：Image Analyst 2021-11-28

在 MATLAB Online 中打开

number is overwritten every iteration so it will take on only the value from the last iteration. If it's zero at the end then data(Month(end)) must have been -1. To not overwrite, do

number = data; % Initilize number;
% Find out what indices have data == 1.
valueIs1 = Month == 1;
number(valueIs1) = 2; % Add 1 to all indices where value is 1, which makes them 2.

If you need help, attach Month and data

save('Answers.mat', 'Month', 'data');

Use the paperclip icon to attach the .mat file.