CASCALC89 COMMAND · NOT ON THE TI-89
Ei(
Returns the exponential integral of a value.
Syntax
Ei(expr)
- Group
- Special functions
- Arguments
- Takes one value or expression.
- Availability
- Included
- Origin
- TI-Nspire CAS style command; the TI-89 Titanium handheld does not have it
Example
| Input | Result |
|---|---|
| Ei(1.) | 1.89511781636 |
Typing Ei(1.) on the home screen and pressing ENTER returns 1.89511781636.
Related commands
- erf(Returns the error function of a value, which is closely related to the normal distribution.
- erfc(Returns the complementary error function, 1 minus erf of the value.
- erfi(Returns the imaginary error function of a value.
- fresnelC(Returns the Fresnel cosine integral of a value.
- fresnelS(Returns the Fresnel sine integral of a value.
- gamma(Returns the gamma function of a value; for a positive integer n, gamma(n) equals (n−1)!.
- gammaInc(Returns the incomplete gamma function of a and x.
- li(Returns the logarithmic integral of a value.