Eigenvalues and eigen vectors routine from the LinearAlgebra EigenValuesVectors, ... Methods in c#

[FF_Grenoble]

I realized from my own program using C#  .NET 2003 Visual Studio and Measurement Studio 7.0 that these routines do not deliver the right values for the Eigen Vectors as they should.

for example simple 2by 2 matrices as   0.5 0.25

                                                                0.25  0.5

should yield 0.25 and 0.75 as eigenvalues which is correct  but in fact eigenvectors turn wrong -1.0 1.0   and 1.0,1.0 instead of 0.7071,-0.7071 and 0.7071,0.7071 which is given by MathCad or Mathematica. The problem is the same using the sample package entiteled "LinearAlgebra" sample.

 and even with the Complex Double  case.

 As i have seen that these problems occurred already with different configuration such as VB6 in the forum discussion, i would be glad to know if it has been fixed and how could i soved it with my presnt MS version.

[kamalb]

Hi
Yes, your are right i can reproduce easily your problem in MS7 and C#
The problem is fixed in Measurement studio 8.0
So, unfortunately, you have to update your version.

Kamal
NI France

[FF_Grenoble]

thank you for your answer

i think we already speak about that together ?

I asked for an upgrade already here  and the the order has been sent

However i have been very disapointed to see that even in such a case NiFrance

could not make a better offer than a regular one.since it was really a bug from the 7.0 version...

 So far after ordering this upgrade i need now to wait  ( for how long?)since any order  processing here is very slow

i dare to ask if there could not be at last a way to get it faster?

by the way i bought myself the visual studio 2005 edition so i could be able to have my programs working easily with the MS 8.0 upgrade