What is sigma function?

19 次查看（过去 30 天）
Tu Nguyen
Tu Nguyen 2022-3-2
评论： Walter Roberson 2022-3-2
Hi all, this is an assignment of from class digtal signal processing. The question 1 is the image "Question1", what is the sigma function? anyone knows please explain to me. How can I plot like the answer?

请先登录，再回答此问题。

回答（1 个）

Steven Lord
Steven Lord 2022-3-2
From Wikipedia: "In general mathematics, uppercase Σ is used as an operator for summation." In MATLAB see the sum function.
I'm guessing you're fairly new to MATLAB, am I right? If so you might want to go through the free MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB. It should take about 2 hours according to the webpage (I haven't actually gone through it myself.)
  1 个评论
Walter Roberson
Walter Roberson 2022-3-2
Also note that δ is not sigma, which would be written as σ . Instead δ represents the Dirac Delta. In that context, δ is a function that is 0 whenever its input is non-zero, and is 1 when the input is exactly 0.
δ(x) = (x==0)
so for example δ(x-3) would be 0 for all x except when x==3 exactly in which case it is 1.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 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