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<font face="Courier New">Sorry for the typo, I meant sin(x)/x, i.e.,
the sinc function.<br>
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<div class="moz-cite-prefix">On 04/02/2020 23:42, Federico Miyara
wrote:<br>
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cite="mid:a1617de3-0e84-b328-ff51-9eb24e3c49fb@fceia.unr.edu.ar">
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<font face="Courier New">Dear All,<br>
<br>
Is there a primitive implementing the sine(x)/x indefinite
integral (called sine integral, Si)?<br>
<br>
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). <br>
<br>
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.<br>
<br>
Regards,<br>
<br>
Federico Miyara <br>
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