<commit_before>// Copyright 2014 <NAME>. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
use std::cmp;
use std::mem;
use libc::c_int;
use num::complex::{
    Complex32,
    Complex64,
};
use error::Error;
use ll::*;
use matrix::{
    Matrix,
};
use scalar::Scalar;
use types::Layout;
use util::transpose_data;

pub trait Gels: Sized {
    fn gels(layout: Layout, a: &mut Matrix<Self>, b: &mut Matrix<Self>) -> Result<(), Error>;
    fn gels_work(layout: Layout, a: &mut Matrix<Self>, b: &mut Matrix<Self>, work: &mut [Self]) -> Result<(), Error>;
    fn gels_work_len(a: &mut Matrix<Self>, b: &mut Matrix<Self>) -> Result<usize, Error>;
}

macro_rules! least_sq_impl(($($t: ident), +) => ($(
    impl Gels for $t {
        fn gels(layout: Layout, a: &mut Matrix<Self>, b: &mut Matrix<Self>) -> Result<(), Error> {
            //TODO: nancheck

            let work_len = try!(Gels::gels_work_len(a, b));
            let mut work: Vec<$t> = Vec::with_capacity(work_len as usize);
            unsafe {
                work.set_len(work_len as usize);
            }

            Gels::gels_work(layout, a, b, &mut work[..])
        }

        fn gels_work(layout: Layout, a: &mut Matrix<Self>, b: &mut Matrix<Self>, work: &mut [Self]) -> Result<(), Error> {
            let mut info: c_int = 0;

            let m = a.rows();
            let n = a.cols();
            let nrhs = b.cols();

            match layout {
                Layout::ColMajor => unsafe {
                    let lda = m;
                    let ldb = b.rows();

                    prefix!($t, gels_)(
                        a.transpose().as_i8().as_mut(),<commit_msg>Derive gels from work functions<commit_after>// Copyright 2014 <NAME>. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
use std::cmp;
use std::mem;
use libc::c_int;
use num::complex::{
    Complex32,
    Complex64,
};
use error::Error;
use ll::*;
use matrix::{
    Matrix,
};
use scalar::Scalar;
use types::Layout;
use util::transpose_data;

pub trait Gels: Sized {
    fn gels(layout: Layout, a: &mut Matrix<Self>, b: &mut Matrix<Self>) -> Result<(), Error> {
        //TODO: nancheck

        let work_len = try!(Gels::gels_work_len(a, b));
        let mut work: Vec<_> = Vec::with_capacity(work_len as usize);
        unsafe {
            work.set_len(work_len as usize);
        }

        Gels::gels_work(layout, a, b, &mut work[..])
    }

    fn gels_work(layout: Layout, a: &mut Matrix<Self>, b: &mut Matrix<Self>, work: &mut [Self]) -> Result<(), Error>;
    fn gels_work_len(a: &mut Matrix<Self>, b: &mut Matrix<Self>) -> Result<usize, Error>;
}

macro_rules! least_sq_impl(($($t: ident), +) => ($(
    impl Gels for $t {
        fn gels_work(layout: Layout, a: &mut Matrix<Self>, b: &mut Matrix<Self>, work: &mut [Self]) -> Result<(), Error> {
            let mut info: c_int = 0;

            let m = a.rows();
            let n = a.cols();
            let nrhs = b.cols();

            match layout {
                Layout::ColMajor => unsafe {
                    let lda = m;
                    let ldb = b.rows();

                    prefix!($t, gels_)(
                        a.transpose().as_i8().as_mut(),
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