pub unsafe extern "C" fn dgemm_(
transa: *const c_char,
transb: *const c_char,
m: *const c_int,
n: *const c_int,
k: *const c_int,
alpha: *const f64,
a: *const f64,
lda: *const c_int,
b: *const f64,
ldb: *const c_int,
Rf_beta: *const f64,
c: *mut f64,
ldc: *const c_int,
arg1: usize,
arg2: usize
)