Function reference · Special functions
Ei
Computes the exponential integral.
Ei evaluates supported numeric arguments and otherwise remains symbolic. The implementation uses the principal real exponential-integral behavior for real inputs.
Ei(0) tends to negative infinity; Ei approaches zero at negative infinity and positive infinity at positive infinity.
Examples
These examples use Nerdamer Notation.
Use the singular value at the origin.
Ei(0) // → -Inf
Keep a symbolic exponential integral.
Ei(x)Interfaces
The same operation is available through the interfaces below.
Nerdamer Notation
Use this form inside input passed to nerdamer(...).
Ei(arg1)nerdamer.Ei
Call the operation through the default nerdamer import.
nerdamer.Ei(x: Expression): ExpressionParameters
| Name | Type | Description |
|---|---|---|
x | Expression | The input expression. |
Returns
Expression — The exponential integral value.