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numel

Number of array elements

Syntax

Description

example

n = numel(A) returns the number of elements, n, in array A, equivalent to prod(size(A)).

Examples

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Number of Elements in 3-D Matrix

Create a 4-by-4-by-2 matrix.

A = magic(4);
A(:,:,2) = A'
A(:,:,1) =
    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1

A(:,:,2) =
    16     5     9     4
     2    11     7    14
     3    10     6    15
    13     8    12     1

numel counts 32 elements in the matrix.

n = numel(A)

n =

    32

Number of Elements in Cell Array of Strings

Create a cell array of strings.

A = {'dog','cat','fish','horse'};

numel counts 4 string elements in the array.

n = numel(A)

n =

     4

Number of Elements in Table

Create a table with four variables listing patient information for five people.

LastName = {'Smith';'Johnson';'Williams';'Jones';'Brown'};
Age = [38;43;38;40;49];
Height = [71;69;64;67;64];
Weight = [176;163;131;133;119];
BloodPressure = [124 93; 109 77; 125 83; 117 75; 122 80];

A = table(Age,Height,Weight,BloodPressure,'RowNames',LastName)
A = 

                Age    Height    Weight     BloodPressure 
                ---    ------    ------    ---------------
    Smith       38     71        176       124          93
    Johnson     43     69        163       109          77
    Williams    38     64        131       125          83
    Jones       40     67        133       117          75
    Brown       49     64        119       122          80

Find the number of elements in the table.

n = numel(A)
n =

     20

numel returns a value equivalent to prod(size(A)) corresponding to the 5 rows and 4 variables.

Input Arguments

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A — Input arrayscalar | vector | matrix | multidimensional array

Input array, specified as a scalar, vector, matrix, or multidimensional array. This includes numeric arrays, logical arrays, character arrays, categorical arrays, tables, structure arrays, cell arrays, and object arrays.

Limitations

  • If A is a table, numel returns the number of elements in the table, A, equivalent to prod(size(A)). Variables in a table can have multiple columns, but numel(A) only accounts for the number of rows and number of variables.

See Also

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