Re: [ublas] VS2012 inconsistent Debug/Release results with lu_substitute() 1.55 & 1.52

Subject: Re: [ublas] VS2012 inconsistent Debug/Release results with lu_substitute() 1.55 & 1.52
From: Nasos Iliopoulos (nasos_i_at_[hidden])
Date: 2014-10-20 11:01:22

jT,
try this:
change line:
std::copy( &(input_data[0][0]), &(input_data[matSize-1][matSize-1]), 
data.begin() );

to:
std::copy( &(input_data[0][0]), &(input_data[matSize-1][matSize-1]) + 
ptrdiff_t(1), data.begin() );

(The last iterator should be one past the last element)

You might get another response that was sent prior to this and has some 
further valid points you may want to keep in mind.

-Nasos

On 10/20/2014 07:53 AM, tidswell wrote:
>
> Folx,
> ublas is not my specialty, so apologies if Ive done something silly, 
> but as I get different results with Debug & Release builds on 
> identical code, I think there is a problem in ublas's interaction with 
> Visual Studio 2012.
> [There may also be problems in my code, but I think its simple enough 
> that I expect consistent answers (I view consistently wrong as better 
> than inconsistent). ]
>
> MS Windows 7
> Visual Studio 2012
> Boost 1.55 or 1.52 (I think also earlier, but I didnt go back that far 
> to test)
>
> Simple usage of Fredrik Orderud's LU decompisition matrix inversion
> http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?LU_Matrix_Inversion 
>
>
> I've disabled _SCL_SECURE_NO_WARNINGS because its not standard C++.
>
> Ive disabled BOOST_UBLAS_TYPE_CHECK because I wanted to check with 
> error control flow caused differences.
>
> Any guidance on why the results are inconsistent ?
>
> thanks,
> - JT
>
>
>
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