Hi Suyong, Thanks for reporting this problem. I have received a bug fix from the author Christian Holm Christiansen. Now in CVS. Rene Brun Suyong Choi wrote: > > Hi, > > It seems like the first data input is discarded and the sigma > isn't right either. I'm using v3.01 on IRIX 6.5 > > root [0] TPrincipal pca1(2,""); > root [1] Double_t *data=new Double_t[2]; > root [2] data[0]=10.0;data[1]=10.0; > root [3] pca1.AddRow(data); > root [4] pca1.Print(); > Variable # | Mean Value | Sigma | Eigenvalue > -------------+------------+------------+------------ > 1 | 10 | 0 | 0 > 2 | 10 | 0 | 0 > > root [5] data[0]=5.0;data[1]=5.0; > root [6] pca1.AddRow(data); > root [7] pca1.Print(); > Variable # | Mean Value | Sigma | Eigenvalue > -------------+------------+------------+------------ > 1 | 5 | 0 | 0 > 2 | 5 | 0 | 0 > > root [8] data[0]=0.0;data[1]=0.0; > root [9] pca1.AddRow(data); > root [10] pca1.Print(); > Variable # | Mean Value | Sigma | Eigenvalue > -------------+------------+------------+------------ > 1 | 2.5 | 0 | 0 > 2 | 2.5 | 0 | 0 > > root [11] pca1.MakePrincipals() > root [12] pca1.Print(); > Variable # | Mean Value | Sigma | Eigenvalue > -------------+------------+------------+------------ > 1 | 2.5 | 1.768 | 1 > 2 | 2.5 | 1.768 | 1.11e-16 > > Regards, > Suyong
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