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