Dear all,
When I use other math tools(such as Mathematica) to integrate my research model, the result contains a term "ExpIntegralEi[x]" which is defined as "-integral (t=-x to t=Infinity) (exp(-t)/t), x > 0". I can use this command in Mathematica, and it has a value. For example, ExpIntegralEi[3.1]= 10.6263. However, since my model is built on Excel, how can also calculate ExpIntegralEi[x] in Excel? Thank you for your kind help.
When I use other math tools(such as Mathematica) to integrate my research model, the result contains a term "ExpIntegralEi[x]" which is defined as "-integral (t=-x to t=Infinity) (exp(-t)/t), x > 0". I can use this command in Mathematica, and it has a value. For example, ExpIntegralEi[3.1]= 10.6263. However, since my model is built on Excel, how can also calculate ExpIntegralEi[x] in Excel? Thank you for your kind help.