Robust Control Toolbox™

Diagonalize vector of uncertain matrices and systems

Syntax

• v = diag(x) 
  

Description

If x is a vector of uncertain system models or matrices, diag(x) puts x on the main diagonal. If x is a matrix of uncertain system models or matrices, diag(x) is the main diagonal of x. diag(diag(x)) is a diagonal matrix of uncertain system models or matrices.

Example

The statement produces a diagonal system mxg of size 4-by-4. Given multivariable system xx, a vector of the diagonal elements of xxg is found using diag.

• x = rss(3,4,1); 
  xg = frd(x,logspace(-2,2,80)); 
  size(xg) 
  
  FRD model with 4 output(s) and 1 input(s), at 80 frequency 
  point(s). 
  
  mxg = diag(xg); 
  size(mxg) 
  FRD model with 4 output(s) and 4 input(s), at 80 frequency 
  point(s). 
  
  xxg = [xg(1:2,1) xg(3:4,1)]; 
  m = diag(xxg); 
  size(m) 
  FRD model with 2 output(s) and 1 input(s), at 80 frequency 
  point(s). 
  

See Also
append      Group models by appending their inputs and outputs

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