![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/277258/image.png)
unknown code- understand it up to the for loop but am lost from there. Can anyone lend a hand? thanks.
2 ビュー (過去 30 日間)
古いコメントを表示
Josh Williams
2020 年 3 月 15 日
編集済み: Image Analyst
2020 年 3 月 15 日
dat=load('data.dat')
a=dat(:,1)
b=dat(:,2)
s=size(a)
s=s(1)
out=zeros(s,1)
for n=1:s
out(n)=(b(n+1)-b(n-1))/(a(n+1)-a(n-1))
end
c=[a out]
0 件のコメント
採用された回答
Thiago Henrique Gomes Lobato
2020 年 3 月 15 日
What the code was supposed to be? it looks like the variable out is suppose to be the numerical derivative of b with respect to a. If the distance between each "a" is uniform and increasing, than this is the central scheme for 1st order differentiation with 2nd order accuracy and the line describe basically
.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/277258/image.png)
2 件のコメント
Thiago Henrique Gomes Lobato
2020 年 3 月 15 日
Size returns two values, so s(1) saves the first dimension in order to perform the loop and size assignment. It would be the same if you did:
s=size(a,1);
out=zeros(s,1);
...
その他の回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Loops and Conditional Statements についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!