RE: Re: st: RE: Re: Calculation of integrals

[Clyde Schechter <cschecht@aecom.yu.edu>]

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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