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signbit

signbit(x)

Returns true if the value of the sign of x is negative, otherwise false.

Examples

1. Check if a number is negative:

   julia> signbit(-3.5)
   true

   This example checks if the sign of -3.5 is negative, which returns true.

2. Check if a number is positive:

   julia> signbit(2.0)
   false

   It determines if the sign of 2.0 is negative, which returns false.

3. Handle zero and positive zero:

   julia> signbit(0.0)
   false
   julia> signbit(-0.0)
   true

   It correctly handles zero and positive zero, returning false for 0.0 and true for -0.0.

Common mistake example:

julia> signbit("hello")
ERROR: MethodError: no method matching signbit(::String)

In this example, the signbit function is applied to a non-numeric value. The signbit function expects a numeric argument, so make sure to provide a valid numeric value to avoid such errors.

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