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// // A rust binding for the GSL library by Guillaume Gomez (guillaume1.gomez@gmail.com) // use ffi; use enums; /// This function tests for the convergence of the interval [x_lower, x_upper] with absolute error epsabs and relative error epsrel. The /// test returns ::Value::Success if the following condition is achieved, /// /// |a - b| < epsabs + epsrel min(|a|,|b|) /// when the interval x = [a,b] does not include the origin. If the interval includes the origin then \min(|a|,|b|) is replaced by zero ( /// which is the minimum value of |x| over the interval). This ensures that the relative error is accurately estimated for minima close to /// the origin. /// /// This condition on the interval also implies that any estimate of the minimum x_m in the interval satisfies the same condition with /// respect to the true minimum x_m^*, /// /// |x_m - x_m^*| < epsabs + epsrel x_m^* /// /// assuming that the true minimum x_m^* is contained within the interval. pub fn test_interval(x_lower: f64, x_upper: f64, epsabs: f64, epsrel: f64) -> enums::Value { unsafe { ffi::gsl_min_test_interval(x_lower, x_upper, epsabs, epsrel) } }