Re: Wald test on mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg82548] Re: Wald test on mathematica
- From: Ray Koopman <koopman at sfu.ca>
- Date: Wed, 24 Oct 2007 04:29:52 -0400 (EDT)
- References: <ffhr2h$4pb$1@smc.vnet.net>
On Oct 22, 2:38 am, "Mauricio Esteban Cuak" <cuak2... at gmail.com>
wrote:
> [...]
> The thing that bothers me is (and it's the same with ols) that I can't use
> this same function if x is a vector instead of a matrix or if r is a vector,
> because mathematica will not allow me to transpose a one-dimensional list.
> What should I do? Should I make a "If, then" thingy or is there some simpler
> way I'm not aware of for dealing with this kind of situatitions?
>
> Thanks!
To convert a vector to a matrix, wrap it in { },
transposing as necessary:
In[1]:= x = {1,2,3}
Dimensions@{x}
Dimensions@Transpose@{x}
Out[1]= {1,2,3}
Out[2]= {1,3}
Out[3]= {3,1}