# or, |

Find logical OR

## Syntax

``A | B``
``or(A,B)``

## Description

example

````A | B` performs a logical OR of inputs `A` and `B` and returns an array or a table containing elements set to either logical `1` (`true`) or logical `0` (`false`). An element of the output is set to logical `1` (`true`) if either `A` or `B` contain a nonzero element at that same location. Otherwise, the element is set to `0`.For bit-wise logical OR operations, see `bitor`.```
````or(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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Find the logical OR of two matrices. The result contains logical `1` (`true`) where either matrix contains a nonzero value. The zeros in the result indicate spots where both arrays have a value of zero.

`A = [5 7 0; 0 2 9; 5 0 0]`
```A = 3×3 5 7 0 0 2 9 5 0 0 ```
`B = [6 6 0; 1 3 5; -1 0 0]`
```B = 3×3 6 6 0 1 3 5 -1 0 0 ```
`A | B`
```ans = 3x3 logical array 1 1 0 1 1 1 1 0 0 ```

Create a truth table for `or`.

`A = [true false]`
```A = 1x2 logical array 1 0 ```
`B = [true; false]`
```B = 2x1 logical array 1 0 ```
`C = A|B`
```C = 2x2 logical array 1 1 1 0 ```

Since R2023a

Create two tables and perform a logical OR of 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([0;2],[0;4],VariableNames=["V1","V2"],RowNames=["R1","R2"])`
```A=2×2 table V1 V2 __ __ R1 0 0 R2 2 4 ```
`B = table([4;2],[3;0],VariableNames=["V2","V1"],RowNames=["R2","R1"])`
```B=2×2 table V2 V1 __ __ R2 4 3 R1 2 0 ```
`A | B`
```ans=2×2 table V1 V2 _____ _____ R1 false true R2 true true ```

## 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.

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` | `table` | `timetable`

## Tips

• You can chain together several logical operations, for example, `A & B | C`.

• The symbols `|` and `||` perform different operations in MATLAB®. The element-wise OR operator described here is `|`. The short-circuit OR operator is `||`.

• When you use the element-wise `&` and `|` operators in the context of an `if` or `while` loop expression (and only in that context), they use short-circuiting to evaluate expressions. Otherwise, you must specify `&&` or `||` to opt-in to short-circuiting behavior. See `Short-Circuit AND` and `Short-Circuit OR` for more information.

## Version History

Introduced before R2006a

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