MATLAB Function Reference |

**Syntax**

**Definitions**

The exponential integral computed by this function is defined as

Another common definition of the exponential integral function is the Cauchy principal value integral

which, for real positive `x`

, is related to `expint`

as

**Description**

```
Y = expint(X)
```

evaluates the exponential integral for each element of `X`

.

**References**

[1] Abramowitz, M. and I. A. Stegun. *Handbook of Mathematical Functions*.
Chapter 5, New York: Dover Publications, 1965.

exp | expm |