Exponential integral
Y = expint(X)
Y = expint(X) evaluates the exponential integral for each element of X.
X
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The exponential integral computed by this function is defined as
E1(x)=∫x∞e−t/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
expint
E1(−x)=−Ei(x)−iπ
[1] Abramowitz, M. and I. A. Stegun. Handbook of Mathematical Functions. Chapter 5, New York: Dover Publications, 1965.
This function fully supports tall arrays. For more information, see Tall Arrays.
This function fully supports GPU arrays. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).
This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).