dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

On 12 September 2011 13:42, Anders Logg <logg@xxxxxxxxx> wrote:
> Why 20? Any perhaps this should be made into a global parameter value?
>

That's just a left over debugging line. I've removed it now.

Garth

> --
> Anders
>
>
> ---------- Forwarded message ----------
> From: noreply@xxxxxxxxxxxxx
> To: Anders Logg <logg@xxxxxxxxx>
> Date: Mon, 12 Sep 2011 12:07:16 -0000
> Subject: [Branch ~dolfin-core/dolfin/main] Rev 6178: Fix problem with pugixml reducing precision of doubles.
> ------------------------------------------------------------
> revno: 6178
> committer: Garth N. Wells <gnw20@xxxxxxxxx>
> branch nick: dolfin-all
> timestamp: Mon 2011-09-12 12:52:42 +0100
> message:
>  Fix problem with pugixml reducing precision of doubles.
>
>  Solution is to cast double to a string before passing to pugixml, thereby avoiding a cast inside pugixml.
> modified:
>  dolfin/io/XMLArray.h
>
>
> --
> lp:dolfin
> https://code.launchpad.net/~dolfin-core/dolfin/main
>
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>
> === modified file 'dolfin/io/XMLArray.h'
> --- dolfin/io/XMLArray.h        2011-07-02 14:50:50 +0000
> +++ dolfin/io/XMLArray.h        2011-09-12 11:52:42 +0000
> @@ -23,6 +23,7 @@
>
>  #include <ostream>
>  #include <string>
> +#include <boost/lexical_cast.hpp>
>  #include "dolfin/common/Array.h"
>  #include "dolfin/log/log.h"
>  #include "pugixml.hpp"
> @@ -90,12 +91,16 @@
>     array_node.append_attribute("type") = type.c_str();
>     array_node.append_attribute("size") = size;
>
> +    std::cout << std::setprecision(20);
> +
>     // Add data
>     for (uint i = 0; i < size; ++i)
>     {
>       pugi::xml_node element_node = array_node.append_child("element");
>       element_node.append_attribute("index") = i;
> -      element_node.append_attribute("value") = x[i];
> +      // NOTE: Casting to a string to avoid loss of precision when
> +      //       pugixml performs double-to-char conversion
> +      element_node.append_attribute("value") = boost::lexical_cast<std::string>(x[i]).c_str();
>     }
>   }
>   //-----------------------------------------------------------------------------
>
>
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