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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