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Aide de Scilab >> Chaînes de caractères > length

# length

length of object

### Calling Sequence

`n = length(M)`

### Arguments

M

a matrix (usual or polynomial or character string) or a list.

n

an integer or a matrix of integers.

### Description

For usual or polynomial matrix `n` is the integer equal to number of rows times number of columns of `M`. (Also valid for `M` a boolean matrix).

For matrices made of character strings (and in particular for a character string) `length` returns in `n` the length of entries of the matrix of character strings `M`.

The length of a list is the number of elements in the list (also given by `size`).

The length of a mlist is by default the number of elements in the mlist, but you can overload it (see example). Note that for a non-string hypermatrix, there is no need to overload the function. Indeed, `length` returns the product of the dimensions of the hypermatrix.

`length('123')` is `3`. `length([1,2;3,4])` is `4`.

 WARNING : `length` of a sparse matrix returns the max of dimensions and not the product of the dimensions. (For example: `length(sparse(eye(12,2)))` returns `max(12,2)` and not `24`). Please use `size(...,'*')` with sparse matrix.

### Examples

```length([123 ; 456 ])
length(['hello world',SCI])
length(rand(2,2,2))```
```a = mlist(["myMlistT" "field1" "field2"],"aexample","bexampleb");
length(a)
// returns 3 default behaviour if length not overloaded for mlist

// we create an overload function for mlist of type myMlistT
function r=%myMlistT_length(M)
r = length(M.field1)
endfunction

length(a)
// returns 8 result of length(a.field1)```

### See Also

• size — taille d'un objet

### History

 Version Description 5.4.0 This function allows overloading for mlist type.
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