Trigonometric Integrals
- Function: double gsl_sf_Si (const double x)
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- Function: int gsl_sf_Si_e (double x, gsl_sf_result * result)
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These routines compute the Sine integral
Si(x) = \int_0^x dt \sin(t)/t.
- Function: double gsl_sf_Ci (const double x)
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- Function: int gsl_sf_Ci_e (double x, gsl_sf_result * result)
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These routines compute the Cosine integral Ci(x) = -\int_x^\infty dt
\cos(t)/t for x > 0.