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# How to use the isone method in Julia

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### Overview

The isone method in Julia checks whether a given value is Not a Numberequal to one.

### Syntax

isone(x) -> Bool
Syntax of the isone function in Julia

### Parameter

This method takes the parameter x, which represents the value be checked. The argument can be a numeric value or an array.

Note: Ifx is an array, the isone method checks whether the array is an identity matrix.

### Return value

This method returns true if the provided value is equal to 1. Otherwise, it returns false.

### Code example

The code below demonstrates how to use the isone method in Julia.

## Find isone of 1
println( "isone(1) => $(isone(1))") # returns true ## Find isone of 1.0 println( "isone(1.0) =>$(isone(1.0))")   # returns true

## Find isone of [1 0; 0 1]
println( "isone([[1 0; 0 1]) => $(isone([1 0; 0 1]))") # returns true ## Find isone of [1 0; 0 2] println( "isone([[1 0; 0 2]) =>$(isone([1 0; 0 2]))")   # returns false
Using the isone method in Julia

### Explanation

In the above code, we do the following:

• Line 2: We use the isone method with (1) as an argument. The isone(1) returns true.
• Line 5: We use the isone method (1.0) as an argument. The isone(1.0) returns true.
• Line 8: We use the isone method with the [1 0; 0 1] array as an argument. The passed array is an identity matrix, so it returns true.
• Line 11: We use the isone method with the [1 0; 0 2] array as an argument. The passed array is not an identity matrix, so it returns false.

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