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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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