[CppAD] LuSolve

[Brad Bell]

Looking at the code in LuSolve, it checks for division by zero and 
returns zero for the signdet in this case; i.e., there should not be any 
Nan's in the factored matrix (unless they are in the original matrix).

Would it be possible for you to output the particular matrix (with lots 
of precision) to an ascii file so that I running LuSolve on it.

Mitch Watrous wrote:
> Hi.
>
> When the factors created by LuSolve contain NaN's, it should return the 
> signdet equal to 0.
>
> But in fact it sometimes generates the following assert:
>
> 		CPPAD_ASSERT_KNOWN(
> 			(imax < n) & (jmax < n) ,
> 			"AbsGeq must return true when second argument is zero"
>
>
> Thanks,
> Mitch
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