tlist

Scilab Function
Last update : September 1995

tlist - Scilab object and typed list definition.

### Calling Sequence

  `tlist(typ,a1,....an )`

### Parameters

- `typ`: Character string or vector of character strings
- `ai`: Any Scilab object (`matrix, list,string...`).

### Description

Creates a `typed-list` with elements `ai`'s. The `typ` argument specifies the list type. Such `typed-list` allow the user to define new operations working on these object through scilab functions. The only difference between `typed-list` and `list` is the value of the type (16 instead of 15).

`typ(1)` specifies the list type (character string used to define soft coded operations)

if specified `typ(i)` may give the `i+1`th element formal name

Standard Operations on `list` work similarly for `typed-list`:

extraction : `[x,y,z...]=l(v)` where `v` is a vector of indices; `[x,y,z]=l(:)` extracts all the elements.

insertion : `l(i)=a`

deletion : `l(i)=null()` removes the i-th element of the `tlist l`.

display

Moreover if `typ(2:n+1)` are specified, user may point elements by their names

We give below examples where tlist are used.

Linear systems are represented by specific `typed-list` e.g. a linear system `[A,B,C,D]` is represented by the tlist `Sys=tlist(['lss';'A';'B';'C';'D';'X0';'dt'],A,B,C,D,x0,'c')` and this specific list may be created by the function `syslin`.

Sys(2), Sys('A') or Sys.A is the state-matrix and Sys('dt') or Sys.dt is the time domain

A rational matrix `H` is represented by the `typed-list` `H=tlist(['r';'num';'den';'dt'],Num,Den,[])` where `Num` and `Den` are two polynomial matrices and a (e.g. continuous time) linear system with transfer matrix `H` maybe created by `syslin('c',H)`.

H(2), H('num') or H.num is the transfer matrix numerator

### See Also

`null`, `percent`, `syslin`, `list`,