Re: TMatrix compatibility between v3.10/02 and v4.03/02

Hi Rene,
  Here is an example:
--thanks, Chris

// root-v3.10/02
{
  TFile f("a.root","recreate");
  TMatrix m(2,3);
  m(0,0)=1; m(0,1)=3; m(0,2)=5;
  m(1,0)=2; m(1,1)=4; m(1,2)=6;

  m.Print();
  m.Write("m");
  m.GetElements();
  f.Close();

Matrix 2x3 is as follows

     | 0 | 1 | 2 |

   0 |          1           3           5
   1 |          2           4           6

elements: [ 1 2 3 4 5 6 ]

//root-v4.01/02 or v4.03/02
{
  TFile f("a.root");
  m->Print();
  m->GetMatrixArray();
}

2x3 matrix is as follows

     | 0 | 1 | 2 |

   0 |          1           2           3
   1 |          4           5           6

elements: [ 1 2 3 4 5 6 ]

Rene Brun wrote:

>Hi Chris,
>
>ROOT version 4 is already doing this. You should be able to read
>old style matrices with the new version.
>Could you send a very short file with an example that does not work?
>
>Rene Brun
>
>On
>Fri, 25
>Mar 2005, Chris Crawford wrote:
>
>
>
>>Hello,
>> When I try and read TMatrices from v3 root files in root-v4, it
>>switches between row-major and column major, jumbling up the entries.
>>Is there some way that the class Schema can fix this? I notices the
>>class version jumped from 2 to 3.
>>--thanks, Chris
>>
>>
>>