Computing values of a formula

Question

Fatemeh Salar 2022-7-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1752335-computing-values-of-a-formula

回答： Fatemeh Salar 2022-7-2

采纳的回答： Abhishek Tiwari

在 MATLAB Online 中打开

Hi,

I tried to solve this equation but apperantly my output is wrong, can you tell me what am I missing ?

clc
clear
close all
n=input('Please enter n : ')
x=input('Please enter x : ')
for k=0:floor(n/2); 
H=((-1)^k)*factorial(n)*(x^(n-2*k))/(2^k*factorial(k)*factorial(n-2*k));
H=H+((-1)^k)*factorial(n)*(x^(n-2*k))/(2^k*factorial(k)*factorial(n-2*k));
end
H

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Answer 1

Abhishek Tiwari 2022-7-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1752335-computing-values-of-a-formula#answer_998590

编辑：Abhishek Tiwari 2022-7-2

在 MATLAB Online 中打开

Hi,

It appears that it is updating and doubling H with each cycle. So, the code you provided just doubles the result of the final step, i.e. when k = floor (n/2). Try initialising H before the loop and remove first line in the 'for' loop as demonstrated

clc
clear
close all
n = 10;
x = 2;
H = 0;
for k=0:floor(n/2); 
    H=H+((-1)^k)*factorial(n)*(x^(n-2*k))/(2^k*factorial(k)*factorial(n-2*k));
end
H
H = -2621