[pymvpa] An error occurs when I use the function "zscore" ...

[冯璐]

But if I use the code like this,
	zscore(dataset, targetdtype="float32"),
the result seems reasonable.

The declaration of the function "zscore" is like this,
	zscore(dataset, mean=None, std=None, perchunk=True, baselinelabels=None, pervoxel=True, targetdtype="float32").
It also said that,
	"If 'baselinelabels' provided, and 'mean' or 'std' aren't provided, it would compute the corresponding measure based only on labels in 'baselinelabels'."

I'm puzzled. When mean=std=baselinelabels=None, what happened to the dataset?


Best wishes!

     Lu FENG
fenglu at fingerpass.net.cn


-----Original Message-----
From: pkg-exppsy-pymvpa-bounces+fenglu=fingerpass.net.cn at lists.alioth.debian.org [mailto:pkg-exppsy-pymvpa-bounces+fenglu=fingerpass.net.cn at lists.alioth.debian.org] On Behalf Of 冯璐
Sent: 2012年2月9日 19:04
To: 'Development and support pf PyMVPA'
Subject: Re: [pymvpa] An error occurs when I use the function "zscore" ...

Thanks a lot. Now the program has run without any error. But after zscoring, nothing happened. The dataset has no change. My code is

	zscore(dataset, mean=0, std=N.ones(dataset.nfeatures), perchunk=True, pervoxel=True, targetdtype="float32")

Best wishes!

     Lu FENG
fenglu at fingerpass.net.cn

-----Original Message-----
From: pkg-exppsy-pymvpa-bounces+fenglu=fingerpass.net.cn at lists.alioth.debian.org [mailto:pkg-exppsy-pymvpa-bounces+fenglu=fingerpass.net.cn at lists.alioth.debian.org] On Behalf Of Yaroslav Halchenko
Sent: 2012年2月9日 7:51
To: Development and support pf PyMVPA
Subject: Re: [pymvpa] An error occurs when I use the function "zscore" ...

our bad -- documentation lied -- apparently std needs to be an array
whenever pervoxel is True (which is the default).

I will patch it up in 0.4.x series (I don't think mvpa2 is prone to it -- will
check too), meanwhile just specify std with an array explicitly

 std=N.ones(dataset.nfeatures)

Cheers and thanks for the report


>    Dear expert,

>     

>           An error occurs  when I use the  function ��zscore�� �� Can  anyone
>    help me? Thank you in advance.

>            zscore(dataset,  mean=0,   std=1,  perchunk=True,   pervoxel=True,
>    targetdtype="float32")

>     
-- 
=------------------------------------------------------------------=
Keep in touch                                     www.onerussian.com
Yaroslav Halchenko                 www.ohloh.net/accounts/yarikoptic

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