Re: PCA with Octave

[Juan Pablo Carbajal]

On Fri, Jul 12, 2013 at 9:47 AM, Mahmood Naderan <address@hidden> wrote:
> Finally I successfully installed the statistics package and now I can see
> princomp(). Here is what I did
>
> octave:1> X=[1 0.7; 2 0.4; 3 0.55; 4 0.2; 5 0.63; 6 0.83; 7 0.48; 8 0.91; 9
> 0.73];
> octave:5> [pc,score,l,t] = princomp(X)
>  warning: XXX FIXME XXX Tsq return from princomp fails some tests
>  pc =
>
>     -0.999358  -0.035833
>     -0.035833   0.999358
>
>  score =
>
>     3.9940e+00   2.3994e-01
>     3.0054e+00  -9.5704e-02
>     2.0006e+00   1.8367e-02
>     1.0138e+00  -3.6724e-01
>    -9.5555e-04   2.6650e-02
>    -1.0075e+00   1.9069e-01
>    -1.9943e+00  -1.9492e-01
>    -3.0091e+00   1.9897e-01
>    -4.0020e+00  -1.6747e-02
>
>  l =
>
>     7.509591
>     0.039609
>
>  t =
>
>     3.577651
>     1.433997
>     0.541503
>     3.541846
>     0.017931
>     1.053196
>     1.488853
>     2.205235
>     2.139788
>
>
> As I look into the figures (from websites) I see two axis which show the
> direction of the data points.
> How can I plot the to axis?
>
>
> Regards,
> Mahmood
>
> ________________________________
> From: Juan Pablo Carbajal <address@hidden>
> To: Jordi Gutiérrez Hermoso <address@hidden>
> Cc: "address@hidden" <address@hidden>
> Sent: Monday, July 8, 2013 6:31 PM
> Subject: Re: PCA with Octave
>
> On Mon, Jul 8, 2013 at 3:17 PM, Jordi Gutiérrez Hermoso
> <address@hidden> wrote:
>> Octave has a princomps function that nobody ever seems to find because
>> it's not named "pca".
>>
>> You don't need to reimplement PCA yourself.
>>
>> - Jordi G. H.
>
> It is in the statistics package...time to rename it...
> http://octave.sourceforge.net/statistics/function/princomp.html
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>

Do you understand what those two vectors are?