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expint

Exponential integral

Syntax

Y = expint(X)

Definitions

The exponential integral computed by this function is defined as

E1(x)=xet/t dt

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

Ei(x)=xet/t dt

which, for real positive x, is related to expint as

E1(x)=Ei(x)iπ

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.

Introduced before R2006a

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