Problem using variable='z^-1' in Z transform with Z^-1 format

11 次查看（过去 30 天）
Ahmad
Ahmad 2022-9-30
回答： Walter Roberson 2022-9-30
Hi Dears ,
What is the difference between one step and two step to define the 'variable'='z^-1'?
I want Z transform function 1/z^3 in term of z^-1 and the two step is ok not one step.
See the Matlab doc for tf, section: "Specify Polynomial Ordering in Discrete-Time Transfer Function"
num=[1];
den=[1 0 0 0];
% Two step is OK!
X1=tf(num,den,0.1)
X1.Variable='z^-1'
% One step is not OK!
X2=tf(num,den,0.1,'variable','z^-1')
X1 not equal X2
Many thanks to dear @Paul

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2022-9-30
Setting the Variable property afterwards just changes the Variable property, without reinterpretting the matrices. It is not a conversion operation, it is just rewriting the label.

类别

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

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by