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3.5.1.3.62 sin_integral
Definition:
/math-e2780038574484a87e6a02e0c1fe841f.png?v=0 "Si = sin\_integral(x)")
evaluates
/math-08c28011c6fde3452b7bcad0a3954c74.png?v=0 "Si(x)=\int_0^x\frac{\sin u}udu")
The approximation is based on several Chebyshev expansions.
For more information please review the s13adc function in the NAG document.
Parameters:
- x (input, double)
- The argument x of the function.
- Si (output, double)
- the approximation of the formula