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Version: Python

isNan

isNaN returns a boolean value indicating whether or not the specified value is NaN (not-a-number).

Syntax

isNaN(value)

Parameters

ParameterTypeDescription
valuedouble

The value to check.

valuefloat

The value to check.

Returns

true if the value parameter is NaN; false otherwise.

Examples

The following example shows how isNaN interacts with various objects within a table.

from deephaven import new_table
from deephaven.column import float_col, double_col
from deephaven.constants import NULL_DOUBLE, NULL_FLOAT

source = new_table([
float_col("Float", [1.0]),
float_col("NullFloat", [NULL_FLOAT]),
float_col("NaNFloat", [-1.0]),
double_col("Double", [1.0]),
double_col("NullDouble", [NULL_DOUBLE]),
double_col("NaNDouble", [-1.0])],
).update(formulas=[
"NaNFloat = java.lang.Math.sqrt(NaNFloat)",
"NaNDouble = java.lang.Math.sqrt(NaNDouble)"
])

result = source.update(formulas=[
"FloatNaN = isNaN(Float)",
"NullFloatNaN = isNaN(NullFloat)",
"NaNFloatNaN = isNaN(NaNFloat)",
"DoubleNaN = isNaN(Double)",
"NullDoubleNaN = isNaN(NullDouble)",
"NaNDoubleNaN = isNaN(NaNDouble)",
])