Scilab object and list function definition (original) (raw)

Scilab 5.3.3

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Scilab help >> Data Structures > list

Scilab object and list function definition

Calling Sequence

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 operatoroverloading facilities (hypermatrices which are multi-dimensionnal arrays in scilab are in fact mlist).

Matlab struct are also available.

Examples