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rdivide, ./

Right array division



x = A./B divides each element of A by the corresponding element of B. The sizes of A and B must be the same or be compatible.

If the sizes of A and B are compatible, then the two arrays implicitly expand to match each other. For example, if one of A or B is a scalar, then the scalar is combined with each element of the other array. Also, vectors with different orientations (one row vector and one column vector) implicitly expand to form a matrix.

x = rdivide(A,B) is an alternative way to divide A by B, but is rarely used. It enables operator overloading for classes.


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Create two numeric arrays, A and B, and divide the second array, B, into the first, A.

A = [2 4 6 8; 3 5 7 9];
B = 10*ones(2,4);
x = A./B
x = 2×4

    0.2000    0.4000    0.6000    0.8000
    0.3000    0.5000    0.7000    0.9000

Divide an int16 scalar value by each element of an int16 vector.

a = int16(10);
b = int16([3 4 6]);
x = a./b
x = 1x3 int16 row vector

   3   3   2

MATLAB® rounds the results when dividing integer data types.

Create an array and divide it into a scalar.

C = 5;
D = magic(3);
x = C./D
x = 3×3

    0.6250    5.0000    0.8333
    1.6667    1.0000    0.7143
    1.2500    0.5556    2.5000

When you specify a scalar value to be divided by an array, the scalar value expands into an array of the same size, then element-by-element division is performed.

Create a 1-by-2 row vector and 3-by-1 column vector and divide them.

a = 1:2;
b = (1:3)';
a ./ b
ans = 3×2

    1.0000    2.0000
    0.5000    1.0000
    0.3333    0.6667

The result is a 3-by-2 matrix, where each (i,j) element in the matrix is equal to a(j) ./ b(i):

a=[a1a2],b=[b1b2b3],          a./b=[a1./b1a2./b1a1./b2a2./b2a1./b3a2./b3].

Input Arguments

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Operands, specified as scalars, vectors, matrices, or multidimensional arrays. Inputs A and B must either be the same size or have sizes that are compatible (for example, A is an M-by-N matrix and B is a scalar or 1-by-N row vector). For more information, see Compatible Array Sizes for Basic Operations.

  • If A or B is an integer data type, then the other input must be the same integer type or be a scalar double. Operands with an integer data type cannot be complex.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | duration | char
Complex Number Support: Yes


  • The element-wise operators ./ and .\ are related to each other by the equation A./B = B.\A.

  • When dividing integers, use idivide for more rounding options.

  • MATLAB® does not support complex integer division.

Extended Capabilities

GPU Code Generation
Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.

Version History

Introduced before R2006a

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