How to use the isone method in Julia

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

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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