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RE: Re: st: RE: Re: Calculation of integrals
I can't help with the LIMDEP. But it is easy to see that with his
simpsler function, 5*ln(x), that Stata gives the correct
result. 5*ln(x) is the derivative of 5*(x*ln(x)-x), so it is easy to
calculate its integral from 1 to 100 in closed form as
5*(100*ln(100)-99) = 1807.5851. The result Emmanouil's code is
1807.2015, which is close enough for most purposes (and -integ-
produces a numerical approximation to the integral).
Clyde Schechter
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