minus, -

Description

example

C = A - B subtracts array B from array A by subtracting corresponding elements. 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 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.

C = minus(A,B) is an alternate way to execute A - B, but is rarely used. It enables operator overloading for classes.

Examples

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Create an array, A, and subtract a scalar value from it.

A = [2 1; 3 5];
C = A - 2
C = 2×2

     0    -1
     1     3

The scalar is subtracted from each entry of A.

Create two arrays, A and B, and subtract the second, B, from the first, A.

A = [1 0; 2 4];
B = [5 9; 2 1];
C = A - B
C = 2×2

    -4    -9
     0     3

The elements of B are subtracted from the corresponding elements of A.

Use the syntax -C to negate the elements of C.

-C
ans = 2×2

     4     9
     0    -3

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

a = 1:2;
b = (1:3)';
a - b
ans = 3×2

     0     1
    -1     0
    -2    -1

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].

Create a matrix, A. Scale the elements in each column by subtracting the mean.

A = [1 9 3; 2 7 8]
A = 2×3

     1     9     3
     2     7     8

A - mean(A)
ans = 2×3

   -0.5000    1.0000   -2.5000
    0.5000   -1.0000    2.5000

Input Arguments

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Operands, specified as scalars, vectors, matrices, or multidimensional arrays. Numeric 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.

  • Operands with an integer data type cannot be complex.

  • Datetime, duration, and calendar duration arrays must be the same size unless one is a scalar.

  • If one input is a datetime array, duration array, or calendar duration array, then numeric values in the other input are treated as a number of 24-hour days.

  • If one input is a string array, then the other input can be a numeric, logical, character, string, or cell array.

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

Compatibility Considerations

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Behavior changed in R2016b

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

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

Introduced before R2006a