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# tlist

Scilab object and typed list definition.

### Calling Sequence

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

### Arguments

- 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`

. Note that the
semantics of `l.x=null()`

is undefined, but a
definition can be given through the overloading mechanism.

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

### Examples

// tlist creation t = tlist(["listtype","field1","field2"], [], []); t.field1(1) = 10; t.field1(2) = 20; t.field2(1) = "Scilab"; t.field2(2) = "tlist"; t.field2(3) = "example"; // Fields contents display disp(t.field1) disp(t.field2) // Generic tlist display disp(t) // Overloading display for this type of tlist function %listtype_p(mytlist) f = fieldnames(mytlist); // typeof(mytlist) <=> f(1) mprintf("Displaying a tlist of type: %s\n", typeof(mytlist)); mprintf("\n"); mprintf("-- Field ''%s'' --\n", f(1)); mprintf("Contents: %s\n", sci2exp(mytlist(f(1)))); mprintf("\n"); mprintf("-- Field ''%s'' --\n", f(2)); mprintf("Contents: %s\n", sci2exp(mytlist(f(2)))); endfunction // Display using overloading function disp(t)

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