On Tue, Jun 12, 2012 at 11:59 AM, Paul Hobson <pmhobson@gmail.com> wrote:
On Mon, Jun 11, 2012 at 11:03 PM, Justin R <justinbrowe@gmail.com> wrote:
> operating system Windows 7
> matplotlib version : 1.1.0
> obtained from sourceforge
>
> the class seems to generate the same Wt matrix for every input. The
> every element of the weight matrix is either +sqrt(1/2) or -sqrt(1/2).
>
> dat1 = 4*np.random.randn(200,1) + 2
> dat2 = dat1*.25 + 1*np.random.randn(200,1)
> pcaObj1 = PCA(np.hstack((dat1,dat2)))
> print pcaObj1.Wt
>
> dat3 = 2*np.random.randn(200,1) + 2
> dat4 = dat3*2 + 3*np.random.randn(200,1)
> pcaObj2 = PCA(np.hstack((dat1,dat2)))
> print pcaObj2.Wt
>
> The output Y seems to be correct, and the projection function works.
> only the Wt matrix seems to be messed up. Am I using this class
> incorrectly, or could this be a bug?
> thanks,
> Justin

Justin, could you post a self-contained script that demonstrates the
issue? Where does this PCA function come from?

In [1]: from pylab import *

In [2]: PCA
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
C:\Users\phobson\<ipython-input-2-dcf6991f51c0> in <module>()
----> 1 PCA

NameError: name 'PCA' is not defined



Paul,

In case you never got an answer to this: PCA is in the mlab submodule, so if you do "from pylab import *", you would use mlab.PCA.  (At least that's the case in matplotlib 1.1.0).

Warren

 
-paul

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users