Displaying 20 results from an estimated 800 matches similar to: "RODBC: How to Retrieve a Column as Rownames?"
2006 Feb 15
2
aggregate data.frame using column-specific functions
Dear Colleagues,
does anybody know how to aggregate a data.frame using different functions for different columns?
Sincerely
___________________
Markus Preisetanz
Consultant
Client Vela GmbH
Albert-Roßhaupter-Str. 32
81369 München
fon: +49 (0) 89 742 17-113
fax: +49 (0) 89 742 17-150
mailto:markus.preisetanz@clientvela.com
2006 Feb 16
1
scatterplot3d: how to show scatterpoints in 2D-space with color as 3rd dimension?
Dear Colleagues:
I have 3 numeric variables (say x, y, z) in a data.frame and want to draw a 2D-scatterplot with the 3rd dimension as color, if possible without having to convert the whole thing to an appropiate matrix for image() manually.
Can e.g. scatterplot3d do something like this? There's a function xyz.convert, but I couldn't find the way to use it properly.
Sincerly,
2006 Feb 14
2
AID / Tree Analysis in R
Dear Colleagues,
I've been looking for a function that can perform a tree analysis, similar to CHAID or QUEST. The key point is that in this case the variables are not binary but nominal (10 different values), so "tree" (from the tree package) won't work. Does anybody know help?
Sincerely,
___________________
Markus Preisetanz
Consultant
Client Vela GmbH
2006 Feb 13
1
Adding dimnames to image()
Dear Colleagues,
does anybody know how to add dimnames to an image. Right now I'm using
image(as.matrix(df3), col=brewer.pal(9,"Blues"))
where df3 is a data.frame.
dimnames(as.matrix(df3)) delivers
[[1]]
[1] "RFM_A1" "RFM_A2" "RFM_A4" "RFM_A5" "RFM_A7" "RFM_B3" "RFM_B6" "RFM_B7"
2006 Jan 26
2
cluster analysis: "error in vector("double", length): given vector size is too big {Fehler in vector("double", length) : angegebene Vektorgröße ist zu groß}
Dear R Specialists,
when trying to cluster a data.frame with about 80.000 rows and 25 columns I get the above error message. I tried hclust (using dist), agnes (entering the data.frame directly) and pam (entering the data.frame directly). What I actually do not want to do is generate a random sample from the data.
The machine I run R on is a Windows 2000 Server (Pentium 4) with 2 GB of
2006 Feb 08
1
ARULES --> Filtering Rules by RHS
Dear Colleagues,
I would like to only inspect rules that contain a certain label substring on the rhs. In this special case the item labels are built like this:
<itemtype>_<itemvalue> e.g. "Artikelgruppe_E0815" what I want to do is only show rules where "Artikelgruppe" is contained in the rhs - has anybody an idea how this could work?
Sincerely
2006 Feb 08
0
Graphics Package --> stars()
Dear Collegues,
does anybody know how I can place a legend at a sensible position in a star diagram automatically? The legend should tell the name of the variable (from colnames) for every color used.
Sincerely, Markus
___________________
Markus Preisetanz
Consultant
Client Vela GmbH
Albert-Roßhaupter-Str. 32
81369 München
fon: +49 (0) 89 742 17-113
fax:
2006 Jul 28
1
arules package: using image() deliveres unexpected results
Dear Collegues,
it seems like there is a problem with the image()-method in the package arules.
Using an ordninary matrix works fine:
image(matrix(rnorm(200), 10, 20), axes = FALSE, col=brewer.pal(9, "Blues") )
delivers an image with blue colors and no axes.
Using an object of the class "associations" (arules package) does not work:
image(items(ta.eclat), axes = FALSE,
2006 Jan 26
1
Clustering Question
Hi group,
My case has N physicians with each seeing M patients.
One physician could have seen a group of patients, or,
a patient could have been seen by multiple number of
physicians. In order words, there are overlaps. Now,
I have the following NxM matrix
Patient#1 Patient#2 Patient#3 .......
Patient#m
Physician#1 1 0 1 .......
0
Physician#2
2006 Aug 07
4
CPU Usage with R 2.1.0 in Windows (and with R 2.3.1)
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2006 Jun 28
4
Problem with nvarchar in MS SQL Server 2000
Hello,
after putting ADO.rb into Directory
\ruby\lib\ruby\site_ruby\1.8\DBD\ADO\ I created a Rails-Application with
MS SQL Server 2000 as Database.
Everything works fine, but into the nvarchar-Field "notice" i can''t
store more than about 50 or 60 characters
MS SQL Server Query analyzer says, this field has a length of 510
characters.
What can i do to save up to the 510
2012 May 21
1
Active Admin help
I have installed active admin and also add my model -controller
rate_professor there.......I can add/delete/edit data using active admin
...but if I click on submit button of my form in rate_professor controller
... I can see whatever I added in the index page ........but I don''t want
to see that one.....I want to find the information(whatever I added by
clicking submit button) on
2008 Oct 17
0
Excessive query time running R-RODBC against SQL Server
Hi, all. I'm using RODBC to query a SQL Server 2005 database, and am
experiencing terribly slow performance. I assume I'm doing something wrong,
but I'm not doing anything fancy, so I'm stumped.
My setup:
Core 2 Duo 2GHz, Win XP, 2GB RAM
R 2.7.1
RODBC (latest from CRAN, not sure the version - how to tell?)
SQL Server 2005
MS Access 2003
SQL Native Client ODBC driver (DSN =
2008 Feb 20
0
Unicode Support for MS SQL Server
In order to coerce Rails 1.2.x into supporting Unicode values for an
attribute in a model, I found I had to do the following:
1) Change the underlying column type from varchar to nvarchar.
2) Prepend any quoted values going into nvarchar columns with a
capital-letter-N, e. g. ''unicode'' becomes N''unicode'' In order to
accomplish this, I modified
2002 Aug 28
1
RODBC: sqlFetch and its argument sqtable
Calling function "sqlFetch" in library(RODBC) and specifying a character
string as 2nd argument, I get an error I don't understand:
library(RODBC)
channel <- odbcConnect("mydatabase.mdb", case="msaccess")
sqlFetch(channel, "mytable")
# this works fine
tabname <- "mytable"; sqlFetch(channel, tabname)
# this gives an error:
# Error in
2002 May 11
2
RODBC sqlFetch
Hi,
Thanks for showing me how to use RODBC and odbcConnect.
Now works nicely. The question I've got now is:
noms <- list.files(pattern=".DBF")
# removing extension names:
noms <- sapply(noms, function(x) as.character(strsplit(x,".DBF")) ,
USE.NAMES=F)
for (i in 1:length(noms)) {
s <- sqlFetch(bdades, noms[i])
# etc.
}
But it seems that sqlFetch()
2012 May 19
2
Loading the stupid dataset--help!!!
I am using the following:
library(RODBC)
chan = odbcConnectExcel("rats-lda")
rats.lda = sqlFetch(chan, "data")
close(chan)
And getting the following error message:
> library(RODBC)
Error in library(RODBC) : there is no package called ?RODBC?
> chan = odbcConnectExcel("rats-lda")
Error: could not find function "odbcConnectExcel"
> rats.lda =
2009 Aug 14
1
RODBC does not like table names >11/12 characters
Hi List,
I used to access a Paradox database using RODBC, but since last week I
am not able anymore to fetch any table which has a name longer than 11
or 12 characters.
Here is the the pattern of my code, nothing spectacular:
library(RODBC)
channel2<-odbcDriverConnect('DSN=xxx')
#table names with up to 11 characters still work
sqlFetch(channel2, 'abcdefghijk')
#table names
2007 Mar 06
2
Package RODBC
I have some questions about the RODBC package.
library(RODBC) # required for those who want to repeat these lines
1st, I noticed that the following sequence does not work:
channel <- odbcConnextExcel("test.xls")
tables <- sqlTables(channel)
name1 <- tables[1, "TABLE_NAME"] # this should be the name
plan1 <- sqlFetch(channel, name1) # bang!
2005 Oct 10
3
sqlFetch on MySQL-DB
Dear all,
I successfully set up a local MySQL-database. Connecting via RODBC is
not problem, the same in fetching 3 of 4 tables. But trying to
connect to table 4 fails.
> author<-sqlFetch(test,"author")
Error in fromchar(unclass(x)) : character string is not in a standard
unambiguous format
In principle I understand that error message, but I don't know any
solution.