length
Number of characters of a string. Number of elements of an array or list.
Syntax
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 an array M of cells or of structures is the number of elements of the array.
It is equivalent to size(M, "*")
.
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 nonstring
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
.
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 — size of objects
History
Version  Description 
5.4.0  This function allows overloading for mlist type. 
6.0.0 

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