[Scilab-users] Sine integral

[Federico Miyara]

Sorry for the typo, I meant sin(x)/x, i.e., the sinc function.


On 04/02/2020 23:42, Federico Miyara wrote:
>
> Dear All,
>
> Is there a primitive implementing the sine(x)/x indefinite integral 
> (called sine integral, Si)?
>
> I couldn't find it either among the special functions or trigonometric 
> functions collections. It is an important function in signal 
> processing (for instance a non-aliased rectangular pulse requires Si).
>
> I know it would be possible to find the value for given x using 
> integrate or intg, but I'm sure it would be much more efficient to use 
> an approximation such as a Taylor series combined perhaps with an 
> asymptotic approximation, than to massively compute a definite 
> integral for each single value.
>
> Regards,
>
> Federico Miyara
>
> _______________________________________________
> users mailing list
> users at lists.scilab.org
> http://lists.scilab.org/mailman/listinfo/users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.scilab.org/pipermail/users/attachments/20200204/afd649c4/attachment.htm>