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Re: Extracting Matrix

• To: mathgroup at smc.vnet.net
• Subject: [mg45412] Re: Extracting Matrix
• From: Yasvir Tesiram <tesiramy at omrf.ouhsc.edu>
• Date: Tue, 6 Jan 2004 04:17:35 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
Here's one way,

X = FlattenAt[CovarianceMatrix/.z)/.MatrixForm->List,1]

Yas

On Mon, 5 Jan 2004, Bruce W. Colletti wrote:

>
> Re Mathematica 5.0 running under WinXP Home.
>
> Am using...
>
>     z = Regress[...RegressionReport->CovarianceMatrix];
>     X = CovarianceMatrix /. z;
>
> ...to extract the given matrix.
>
> However, when I use X[[k,k]] to access the k'th diagonal element, I get
> a row instead!  The culprit is that MatrixForm is the X-head (as
> FullForm reveals).
>
> How can I strip away this head and make X a list of lists?
>
> Thankx.
>
> Bruce
>