EigenValsVecs question

Ruslan_G_ — Wed, 30 Mar 2016 13:18:02 GMT

Hello! I compared results of EigenValsVecs functions in IPP and OpenCV and found that in some cases ippiEigenValsVecs function returns exactly (1.0f, 0.0f) and (0.0f, 1.0f) eigen vectors although OpenCV returns eigen vectors which are not even close to vectors obtained with IPP.

For example with input 5x5 matrix

-116.127525f,      -152.685074f,       108.699646f,     -168.813187f,      166.688339f,
-195.550934f,       142.426865f,       63.002094f,       67.792168f,        66.547188f,
   40.681679f,        91.366081f,     -10.763326f,      186.464005f,      164.351349f,
   44.740143f,        64.384964f,      -80.919853f,       -29.437082f,       45.215580f,
   95.272400f,        21.906961f,       84.793060f,       -50.961384f,      250.437256f

IPP returns (1.0f, 0.0f) and (0.0f, 1.0f) eigen vectors for the (3, 3) element of the matrix, but OpenCV returns (-0.540550, 0.841312) and (-0.841312, -0.540550).

Is there any reason for such behavior or some criteria when it appear?

Hi,

Chao_Y_Intel — Fri, 08 Apr 2016 03:08:09 GMT

Hi,

Thanks for your report. We are checking now. Which version of IPP are you testing now?

Regards,
Chao

Thanks for your answer. I'm

Ruslan_G_ — Fri, 08 Apr 2016 08:17:07 GMT

Thanks for your answer. I'm testing IPP 9.0.

Rusian,

Chao_Y_Intel — Mon, 11 Apr 2016 07:12:03 GMT

Rusian,

thanks for the information. The engineer is checking the code now, and I will provide you further feedback.

Regards,
Chao

topic EigenValsVecs question in Intel® Integrated Performance Primitives

EigenValsVecs question

Hi,

Thanks for your answer. I'm

Rusian,