I was wondering if there was a function like "does connection exists" ?
I am currently using loops to build up a database, and I have either
> B = getConnection(localization)
Error in getConnection(localization) : there is no connection -2147483648
In addition: Warning message:
In getConnection(l
ultsfromtennis.com/2007/atp/wimbledon.html"; does exist, I can
get the tables inside
but
"http://www.resultsfromtennis.com/1977/atp/shertogenbosch.html";
does not exist... is there a way to detect that the html page does not exist
?
2010/12/13 Duncan Murdoch
> On 13/12/201
great, exactly what I've being looking for !
thanks a lot !
2010/12/13 Duncan Murdoch
> On 13/12/2010 12:56 PM, Arthur Charpentier wrote:
>
>> sorry... localization is a string of characters
>> for instance
>> localization =
>> paste("http://www.resul
Dear users,
I am currently using scan(,what="character") to read - automacally - some
html pages,
I was wondering if there was an option to "hide" my IP-adress, or to use a
"fake" one ?
I would like to chek if the website is using my IP-adress to change the
content of the page (it is the price of a
I do have some trouble with matrices. I want to build up a covariance matrix
with a hierarchical structure). For instance, in dimension n=10, I have two
subgroups (called REGION).
NR=2; n=10
CORRELATION=matrix(c(0.4,-0.25,
-0.25,0.3),NR,NR)
REGION=sample(1:NR,size=n,replace=TR
ile theoretically it should be 0 (if it was [1] 2.109071e-17 I guess it
would work, the problem is the minus sign)
Arthur
2011/5/6 Petr Savicky
> On Thu, May 05, 2011 at 02:31:59PM -0400, Arthur Charpentier wrote:
> > I do have some trouble with matrices. I want to build up a covariance
> ma
GMA)$values)
[1] 0.6
2011/5/6 Arthur Charpentier
> thanks for the tip
> actually, I know that the covariance matrix has rank 2, but it should still
> be definite positive (not strictly positive, but positive)
> my problem is that Cholesky needs a positive matrix...
> my concern is tha
