gttrf
- void gttrf(f_int n, f_float* dl, f_float* d, f_float* du, f_float* du2, f_int* ipiv, f_int info)
- void gttrf(f_int n, f_double* dl, f_double* d, f_double* du, f_double* du2, f_int* ipiv, f_int info)
- void gttrf(f_int n, f_cfloat* dl, f_cfloat* d, f_cfloat* du, f_cfloat* du2, f_int* ipiv, f_int info)
- void gttrf(f_int n, f_cdouble* dl, f_cdouble* d, f_cdouble* du, f_cdouble* du2, f_int* ipiv, f_int info)
Computes an LU factorization of a general tridiagonal matrix, using partial pivoting with row interchanges.