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# list

Scilab object and list function definition

### Calling Sequence

list(a1,....an)

### Description

Creates a `list`

with elements `ai`

's which are arbitrary Scilab
objects (`matrix, list,...`

). Type of `list`

objects is 15.
`list()`

creates the empty `list`

(0 element).

### Operations on lists

- extraction
`[x,y,z...]=L(v)`

where`v`

is a vector of indices;`[x,y,z]=L(:)`

extracts all the elements.- insertion at index i
`L(i)=a`

(note that it is not an error to use`L(i)=a`

with*i > 1 + size(L)*but some list entries are then undefined and their extraction gives raise to an error).- append an element in queue
`L($+1)=e`

.- append an element in head
`L(0)=e`

. (note that after this operation`e`

is at index 1, the initial elements being shifted on the right).- deletion
`L(i)=null()`

removes the i-th element of the list`L`

.- concatenation of two lists
`L3 = lstcat(L1,L2)`

.- number of elements of a list
you can use either

`nb_elm = size(L)`

or`nb_elm = length(L)`

.- iterations with a list
it is possible to use a list

`L`

with a for loop:`for e=L,...,end`

is a loop with`length(L)`

iterations, the loop variable`e`

being equal to`L(i)`

at the i th iteration.

### Remarks

Scilab provides also other kinds of list, the tlist type (typed list) and
the mlist type which are useful to define a new data type with operator
overloading facilities (hypermatrices which are
multi-dimensionnal arrays in scilab are in fact *mlist*).

Matlab *struct* are also available.

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