Function gsl_sys::gsl_interp2d_eval_deriv_yy

pub unsafe extern "C" fn gsl_interp2d_eval_deriv_yy(
    interp: *const gsl_interp2d, 
    xarr: *const f64, 
    yarr: *const f64, 
    zarr: *const f64, 
    x: f64, 
    y: f64, 
    xa: *mut gsl_interp_accel, 
    ya: *mut gsl_interp_accel
) -> f64