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length

Length of largest array dimension

Syntax

Description

example

L = length(X) returns the length of the largest array dimension in X. For vectors, the length is simply the number of elements. For arrays with more dimensions, the length is max(size(X)). The length of an empty array is zero.

Examples

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Find the length of a uniformly spaced vector in the interval [5,10].

v = 5:10
v =

     5     6     7     8     9    10

L = length(v)
L =

     6

Find the length of a 3-by-7 matrix of zeros.

X = zeros(3,7);
L = length(X)
L =

     7

Create a structure with fields for Day and Month. Use the structfun function to apply length to each field.

S = struct('Day',[1 13 14 26],'Month',{{'Jan','Feb', 'Mar'}})
S = 

  struct with fields:

      Day: [1 13 14 26]
    Month: {'Jan'  'Feb'  'Mar'}

L = structfun(@(field) length(field),S)
L =

     4
     3

Input Arguments

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Input array, specified as a numeric array, character array, logical array, structure, cell array, categorical array, datetime array, duration array, or calendarDuration array.

length does not operate on tables. To examine the dimensions of a table, use the height, width, or size functions.

Complex Number Support: Yes

More About

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Tall Array Support

This function fully supports tall arrays. For more information, see Tall Arrays.

See Also

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Introduced before R2006a

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