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Number of array dimensions




N = ndims(A) returns the number of dimensions in the array A. The number of dimensions is always greater than or equal to 2. The function ignores trailing singleton dimensions, for which size(A,dim) = 1.


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Create a row vector.

A = 1:5;

Find the number of dimensions in the vector.

ans =


The result is 2 because the vector has a size of 1-by-5.

Create a cell array of character vectors.

A{1,1,1} = 'cell_1';
A{1,1,2} = 'cell_2';
A{1,1,3} = 'cell_3'
  1×1×3 cell array

A(:,:,1) = 


A(:,:,2) = 


A(:,:,3) = 


Find the number of dimensions of the cell array.

ans =


The result is 3 because the cell array has a size of 1-by-1-by-3.

Input Arguments

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Input array, specified as a scalar, vector, matrix, multidimensional array, table, or timetable.

Data Types: double | single | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char | string | struct | cell | table | timetable | categorical | datetime | duration | calendarDuration

More About

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Tall Array Support

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


The number of dimensions in an array is the same as the length of the size vector of the array. In other words, ndims(A) = length(size(A)).

See Also


Introduced before R2006a

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