Hello all,
I am considering using Gretl for a Statistics class I teach in an executive MBA
program. I am think about this because (i) Gretl is free for students to use,
and (ii) it does not require admin rights to install. Point (ii) is the most
important. My consern is that while Gretl is
On 12/07/2012 08:31 PM, Alan G Isaac wrote:
> On 12/7/2012 1:52 PM, Summers, Peter wrote:
>> But your example holds true whether or not we write x'y or x'*y
>
>
> Absolutely. I was addressing only the issue of
> how to handle a 1 x 1 matrix, not the core question.
>
> I agree that many matrix
On 12/07/2012 09:03 PM, Allin Cottrell wrote:
> On Fri, 7 Dec 2012, Sven Schreiber wrote:
>
>> in working with a lot of Kronecker products, I noticed the following:
>>
>> ** seems to take precedence over * (standard matrix multiplication). Of
>> course that's just a convention and as such is
On Sat, 8 Dec 2012, Sven Schreiber wrote:
> On 12/07/2012 11:08 PM, Allin Cottrell wrote:
>> On Fri, 7 Dec 2012, Sven Schreiber wrote:
>>
>>> On 12/07/2012 08:31 PM, Alan G Isaac wrote:
On 12/7/2012 1:52 PM, Summers, Peter wrote:
> But your example holds true whether or not we write x'y
> E.g., (1x2)*((2x1)*(2x2)) -> error (as it should be) but ((1x2)*(2x1))*(2x2)
> -> (2x2) So much for associativity.
But associativity assumes all products are well-defined. A*(B*C) in your
example generates an error because B*C fails.
PS
-Original Message-
From:
Hi,
when lags() is applied to a list (of series), then the result is grouped
by variables, i.e. lags(2,mylist) gives
x_1 x_2 y_1 y_2
if x and y are the list members.
In the VAR/VECM context we typically have the variables ordered by lags
instead, i.e. we need
x_1 y_1 x_2 y_2.
(For example,
On Fri, 7 Dec 2012, Sven Schreiber wrote:
> On 12/07/2012 08:31 PM, Alan G Isaac wrote:
>> On 12/7/2012 1:52 PM, Summers, Peter wrote:
>>> But your example holds true whether or not we write x'y or x'*y
>>
>>
>> Absolutely. I was addressing only the issue of
>> how to handle a 1 x 1 matrix, not
On Fri, 7 Dec 2012, Sven Schreiber wrote:
> in working with a lot of Kronecker products, I noticed the following:
>
> ** seems to take precedence over * (standard matrix multiplication). Of
> course that's just a convention and as such is fine, but I couldn't find
> any mention of it in the
On 12/7/2012 12:58 PM, Summers, Peter wrote:
> But associativity assumes all products are well-defined. A*(B*C) in your
> example generates an error because B*C fails.
Indeed.
That is the point of the example.
Am 07.12.2012 12:22, schrieb Stefano Fachin:
> I bumped into a feature of Hansl that may be produce puzzling results:
> using the "pre-multiplication by transpose" notation X'Y with X a 1x1
> matrix (that is, defined as a matrix, but with 1 row and 1 column, for
> instance because the result of
I bumped into a feature of Hansl that may be produce puzzling results:
using the "pre-multiplication by transpose" notation X'Y with X a 1x1
matrix (that is, defined as a matrix, but with 1 row and 1 column, for
instance because the result of the product of a row vector for a column
vector)
Hi,
in working with a lot of Kronecker products, I noticed the following:
** seems to take precedence over * (standard matrix multiplication). Of
course that's just a convention and as such is fine, but I couldn't find
any mention of it in the manual -- or did I miss it? (This basically
12 matches
Mail list logo
