sign

sign(x)

Return zero if x==0 and $x/|x|$ otherwise (i.e., Â±1 for real x).

Examples

In the Julia programming language, the function sign(x) returns zero if x is equal to zero, and x/|x| otherwise. It essentially returns ±1 for real x. Here are some examples of its usage:

Determine the sign of a number:
```
julia> sign(5)
1

julia> sign(-3)
-1
```
This example shows how the sign function returns 1 for positive numbers and -1 for negative numbers.
Handle zero input:
```
julia> sign(0)
0
```
When the input is zero, the sign function returns 0.
Compute the sign of an array:
```
julia> arr = [-2, 4, -6, 8];
julia> sign.(arr)
4-element Array{Int64,1}:
-1
 1
-1
 1
```
By using the dot syntax (.), we can apply the sign function element-wise to an array.

Common mistake example:

julia> sign("Hello")
ERROR: MethodError: no method matching sign(::String)

In this example, the sign function is applied to a string, which is not a valid argument. The sign function is only applicable to numeric types. Make sure to pass appropriate numeric values to the sign function to avoid such errors.

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sign

Examples

See Also

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