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# How to use the isnan() method in Julia?

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### Overview

The isnan(x) method checks whether or not the given value is NaNNot a Number.

### Syntax

isnan(f) -> Bool
The Julia isnan function

### Argument(s)

x: This is the value that is to be checked.

### Return value

This method returns true if the provided value is NaN. Otherwise, it returns false.

### Code

The code below demonstrates the use of the isnan() method:

## find isnan of 0 / 0
println( "isnan(0 / 0) => $(isnan(0 / 0))") ## find isnan of NaN println( "isnan(NaN) =>$(isnan(NaN))")

## find isnan of 10
println( "isnan(10) => \$(isnan(10))")
Using the isnan method

### Explanation

• Line 2: We use the isnan() method with (0/0) as an argument. Dividing zero by 0 produces a NaN value. Therefore, the isnan(0/0) returns true.
• Line 5: We use the isnan() method with NaN as an argument. The isnan(NaN) returns true .
• Line 8: We use the isnan() method with 10 as an argument. The isnan(10) returns false because 10 is a finite value and not a NaN value.

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