I need to input a matrix of size 2x2 which is something like this A= [ 1 - 1.8629z-1 + 0.8669z-2 , 0 ; 0 , 1 -1.8695z-1 + 0.8737z- 2 ] which is a 2x2 Matrix

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Nithyaananth 2024-3-29

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评论： Nithyaananth 2024-3-29

I need to input this into my Code.

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Star Strider 2024-3-29

Does it have an associated denominator polynomial in z?

Nithyaananth 2024-3-29

Basically, the first matrix is the discretized transfer functions for a 2 input and 2 output system. Next to get A(z^-1) = [(den11)*(den12) 0; 0 (den21)*(den22)] this has to be done.

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Answer 1

John D'Errico 2024-3-29

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编辑：John D'Errico 2024-3-29

在 MATLAB Online 中打开

So do it. What is the problem? If z is known, then just type it in, pretty much as written.

Do you know how to raise a number to a power? Actually, z^-1 is just 1/z, a far simpler way to write the power. For example:

z = 1.5;
A = [1-1.8629/z + 0.8669/z^2, 0; ...
    0, 1 - 1.8695/z + 0.8737/z^2]
A = 2×2
    0.1434         0
         0    0.1420
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If all of this seems foreign to you, then you STRONGLY need to start with the basics of MATLAB. Do the MATLAB Onramp. And there are other basic MATLAB tutorials to be found.

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Nithyaananth 2024-3-29

Z is not known here,

Basically, the first matrix is the discretized transfer functions for a 2 input and 2 output system. Next to get A(z^-1) = [(den11)*(den12) 0; 0 (den21)*(den22)] this has to be done.

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Answer 2

Torsten 2024-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/2100486-i-need-to-input-a-matrix-of-size-2x2-which-is-something-like-this-a-1-1-8629z-1-0-8669z-2#answer_1433286

在 MATLAB Online 中打开

Define A as a function of z:

A = @(z)[1-1.8629*z,0;0,1-1.8695*z+0.8737*z^2];
A(2) 
ans = 2x2
   -2.7258         0
         0    0.7558
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or as a symbolic matrix

syms z A(z)

A(z) = [1-1.8629*z,0;0,1-1.8695*z+0.8737*z^2];

A(2)

ans =