Evaluates the sine integral for any real number x as defined by si(x) = integral of sin(s)/s between 0 and x. It is si(-x)= -si(x). Details
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x is any real number. |
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si(x) is the result of the calculation of the sine integral for the given value of x. |
An efficient algorithm is based on a continued fraction of the combined function
more precisely on
The following diagram shows the graph of the sine integral in the interval (0,15).