清空筛选条件
清空筛选条件

what is the correct formula of (sum of ...from...to...) in matlab

1 次查看（过去 30 天）
Good mind
Good mind 2017-4-27
评论： Good mind 2017-4-30
snrin=(-5:5:55); %initial snr
N=length(ecg); % length of ecg signal
n=(0:N-1);
e=sum (ecg^2) from 0 to N-1; **% I want to write this formula correctly**
f=sum (W^2) from 0 to N-1; *% also this*
A=sqrt(e/(10^(snrin/10))*f); *% also this one*
  2 个评论
James Tursa
James Tursa 2017-4-27
How is the indexing from 0 to N-1 related to the variable "ecg"? I.e., what would an index of 0 mean? Same question for the other sums.
Good mind
Good mind 2017-4-27
ECG is a signal sampled with 360hz. 0 to N-1 i.e means along the length of ecg signal

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2017-4-27
e = sum( ecg(1+n).^2 );
f = sum( W(1+n).^2 );
  7 个评论
显示 5更早的评论
Walter Roberson
Walter Roberson 2017-4-30
ecgnoisy = repmat(ecg(:), 1, length(A)) + repmat(W(:), 1, length(A)) .* repmat(A, numel(W), 1);

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Descriptive Statistics 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by