isnan ("is not a number") function

Syntax

bool   isnan(value)

bool[] isnan(values)

Parameters

• value (float)
• values (float[])

Returns

true if value is not a number, false otherwise.

For an array values a new array is returned containing the result of each element.

Related

• isinf function
• isNull function

Examples

isnan(1)
# result = false	

isnan(ln(-1))
# result = true

isnan(float("a"))
# result = true

isnan([1, ln(-1)])
# result = [false, true]

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