How to code below mathematical formula?

Question

Hassan Ashraf 2019-7-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470034-how-to-code-below-mathematical-formula

编辑： KALYAN ACHARJYA 2019-7-3

采纳的回答： Stephen23

I want to implement a below mathematical function in MATLAB, can anyone help me out?

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Answer 1

Stephen23 2019-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/470034-how-to-code-below-mathematical-formula#answer_381780

编辑：Stephen23 2019-7-3

在 MATLAB Online 中打开

The simple MATLAB solution:

>> x = 1:30;
>> t = 23; % threshold
>> MYOP = sum(x>=t)/numel(x)
MYOP =
      0.26667

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Hassan Ashraf 2019-7-3

Thank you :)

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Answer 2

KALYAN ACHARJYA 2019-7-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470034-how-to-code-below-mathematical-formula#answer_381771

编辑：KALYAN ACHARJYA 2019-7-3

在 MATLAB Online 中打开

x=     %define x value range
n=     %define n
threshold=   %define threshold value
fx=x;
idx1=find(fx>=threshold);
fx(idx)=1;
idx1=find(fx<threshold);
fx(idx)=0;
MYOP=(sum(fx(1:n)))/n;

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Hassan Ashraf 2019-7-3

Thank you :)

Stephen23 2019-7-3

编辑：Stephen23 2019-7-3

在 MATLAB Online 中打开

Note that this answer does not implement the formula given in the question.

In particular it does not include f(x) in any way within the sum, as the question indicates. It also does not vectorize the generation of fx (or use a loop), so it is unlikely to be a useful approach anyway.

The code throws an error when run because xi is not defined:

Undefined function 'xi' for input arguments of type 'double'.

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