# logical function

#### logical

Convert numeric values to logical (1 or 0)

Syntax

```    K = logical(A)
```

#### Description

K = logical(A) returns an array that can be used for logical indexing or logical tests.
A(B), where B is a logical array, returns the values of A at the indices where the real part of B is nonzero. B must be the same size as A.

#### Remarks

Most arithmetic operations remove the logicalness from an array. For example, adding zero to a logical array removes its logical characteristic. A = +A is the easiest way to convert a logical array, A, to a numeric double array.

Logical arrays are also created by the relational operators (==,<,>,~, etc.) and functions like any, all, isnan, isinf, and isfinite.

#### Example

If a contains elements other than Os and Is, the logical function converts all nonzero quantities to logical Is and all entries with value 0 to logical Os. Using relational and logical operators.

```>> a = [1,2,3;4,5,6;7,8,9]

a =

1     2     3
4     5     6
7     8     9
```

After converting to Matlab is shows the following results.

```>> b = logical(a)

b =

1     1     1
1     1     1
1     1     1
```
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