# times, .*

Multiplication

## Syntax

``C = A.*B``
``C = times(A,B)``

## Description

example

````C = A.*B` multiplies arrays `A` and `B` by multiplying 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 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.```
````C = times(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 two vectors, `A` and `B`, and multiply them element by element.

```A = [1 0 3]; B = [2 3 7]; C = A.*B```
```C = 1×3 2 0 21 ```

Create two 3-by-3 arrays, `A` and `B`, and multiply them element by element.

```A = [1 0 3; 5 3 8; 2 4 6]; B = [2 3 7; 9 1 5; 8 8 3]; C = A.*B```
```C = 3×3 2 0 21 45 3 40 16 32 18 ```

Create a row vector `a` and a column vector `b`, then multiply them. The 1-by-3 row vector and 4-by-1 column vector combine to produce a 4-by-3 matrix.

```a = 1:3; b = (1:4)'; a.*b```
```ans = 4×3 1 2 3 2 4 6 3 6 9 4 8 12 ```

The result is a 4-by-3 matrix, where each (i,j) element in the matrix is equal to `a(j).*b(i)`:

`$\mathit{a}=\left[\begin{array}{ccc}{\mathit{a}}_{1}& {\mathit{a}}_{2}& {\mathit{a}}_{3}\end{array}\right],\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathit{b}=\left[\begin{array}{c}{\mathit{b}}_{1}\\ {\mathit{b}}_{2}\\ {\mathit{b}}_{3}\\ {\mathit{b}}_{4}\end{array}\right],\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}\text{\hspace{0.17em}}\mathit{a}\text{\hspace{0.17em}}.*\text{\hspace{0.17em}}\mathit{b}=\left[\begin{array}{ccc}{\mathit{a}}_{1}{\mathit{b}}_{1}& {\mathit{a}}_{2}{\mathit{b}}_{1}& {\mathit{a}}_{3}{\mathit{b}}_{1}\\ {\mathit{a}}_{1}{\mathit{b}}_{2}& {\mathit{a}}_{2}{\mathit{b}}_{2}& {\mathit{a}}_{3}{\mathit{b}}_{2}\\ {\mathit{a}}_{1}{\mathit{b}}_{3}& {\mathit{a}}_{2}{\mathit{b}}_{3}& {\mathit{a}}_{3}{\mathit{b}}_{3}\\ {\mathit{a}}_{1}{\mathit{b}}_{4}& {\mathit{a}}_{2}{\mathit{b}}_{4}& {\mathit{a}}_{3}{\mathit{b}}_{4}\end{array}\right].$`

Since R2023a

Create two tables and multiply them. The row names (if present in both) and variable names must be the same, but do not need to be in the same orders. Rows and variables of the output are in the same orders as the first input.

`A = table([1;2],[3;4],VariableNames=["V1","V2"],RowNames=["R1","R2"])`
```A=2×2 table V1 V2 __ __ R1 1 3 R2 2 4 ```
`B = table([4;2],[3;1],VariableNames=["V2","V1"],RowNames=["R2","R1"])`
```B=2×2 table V2 V1 __ __ R2 4 3 R1 2 1 ```
`C = A .* B`
```C=2×2 table V1 V2 __ __ R1 1 6 R2 6 16 ```

## Input Arguments

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Operands, specified as scalars, vectors, matrices, multidimensional arrays, tables, or timetables. 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.

Inputs that are tables or timetables must meet the following conditions: (since R2023a)

• If an input is a table or timetable, then all its variables must have data types that support the operation.

• If only one input is a table or timetable, then the other input must be a numeric or logical array.

• If both inputs are tables or timetables, then:

• Both inputs must have the same size, or one of them must be a one-row table.

• Both inputs must have variables with the same names. However, the variables in each input can be in a different order.

• If both inputs are tables and they both have row names, then their row names must be the same. However, the row names in each input can be in a different order.

• If both inputs are timetables, then their row times must be the same. However, the row times in each input can be in a different order.

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

## Version History

Introduced before R2006a

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