Re: [R] How to get correct integration in C for step function?

From: Lynette <fuyaonv_at_hotmail.com>
Date: Mon 22 Jan 2007 - 16:53:26 GMT

Well,

I have no idea either. I can get correct answers for continous functions but incorrect for step functions.

Sign, I have been trying to realize the integration in C for long time.

Thank you for your answering.

Best,
Lynette

> On Sun, 21 Jan 2007, Lynette wrote:
>
>> Dear all,
>>
>> I am using Rdqags in C to realize the integration. It seems for the
>> continous C function I can get correct results. However, for step
>> functions,
>> the results are not correct. For example, the following one, when
>> integrated
>> from 0 to 1 gives 1 instead of the correct 1.5
>>
>
> Using integrate() in R for an R-defined step function gives the right
> answer (eg on the example in ?ecdf).
>
> This suggests a problem in your C code, since integrate() just calls
> dqags.
>
> -thomas
>



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