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numel

  

number of elements in an array

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

numel(M)

numel(M, i, j, ...)

Parameters

M

-

array

i, j

-

array indices

Description

• 

The numel(M) function returns the number of elements in the array, M, or the number of elements in the subreference M[i,j].

• 

numel does not perform bounds checking of the subreference index to assure that the index is valid.  Therefore, numel(M,5,5) will still return 1, the size of a subreference of the form M[5,5], even for a 2 x 2 array, M.  

• 

The special string, ":" can be used to denote the range of an entire dimension, for example, numel(M,":",1).  Or, ":" by itself as in numel(M,":") can be used to denote the whole array, which is equivalent to numel(M).

Examples

withMTM:

MMatrix2,3

M000000

(1)

numelM

6

(2)

numelM,1,2,2

2

(3)

numelM,1,:

3

(4)

See Also

ArrayTools[NumElems]

MTM[array_dims]

MTM[size]

MTM[subsref]