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
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