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function Y = ei(X) %EI One argument exponential integral function. % Y = EI(X) is the 1-argument exponential integral. It is % defined as: % % EI(x) = integral from -Inf to x of exp(t)/t dt % % See also EXPINT, SYM/EXPINT. % Copyright 2013 The MathWorks, Inc. Y = privUnaryOp(X,'symobj::vectorizeSpecfunc','Ei','-infinity'); end