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how to code the EI[-any number] (exponential integral) in our closed form expression?

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Shashibhushan Sharma
评论： Shashibhushan Sharma 2017-12-5
I got my closed form expression in EI[negative number]. When I integrate the integration by numerical method then it matched with the simulation, but I do not known how to code in exponential integral in closed form. I used the expint(negative number) it give real and imaginary number and also my simulation curve does not match with analytical curve. Please help me.
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Shashibhushan Sharma
Shashibhushan Sharma 2017-12-4
编辑：Shashibhushan Sharma 2017-12-4
Can you help me in substitution method? I am.unable to solve this form of integration. Please help me.
Shashibhushan Sharma
Shashibhushan Sharma 2017-12-5
After a number of attempt, I did not find my solution. If someone can understand my problem then he can help me. Thanks

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Torsten
Torsten 2017-12-5
编辑：Torsten 2017-12-5
I get
I = 1-exp(-(A4-1)/T)*(A2*A3*exp((A2+A5)*A3)*expint(A3*(A2+A5))+A3*(A2+A5)*exp(-A3*(A2+A5))-A3^2*(A2+A5)^2*expint(A3*(A2+A5)))
Best wishes
Torsten.
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