Displaying 20 results from an estimated 10000 matches similar to: "multi variable analysis"
2012 Dec 28
4
efficiently multiply different matrices in 3-d array with different vectors?
Hello,
I have been wondering of an efficient way to do this:
I have an n x m x p array Z and a p x n matrix Y.
I want to multiply each of the n matrices with the corresponding column
vector of Y.
In other words, I am wanting to matrix multiply:
Z[i, ,] %*% Y[, i]
which will give me a (two-dimensional) array or matrix of dimension n x
p with the i'th row storing the above.
Any pointers
2012 Jan 03
1
sqldf and not converting integers to floating point in SQLite
Hi,
I have following 2 tables:
Table 1:
POSTAL | VALUE
1000|49
1010|100
1020|50
Table 2:
INSEE | POSTAL
A|1000
B|1000
C|1010
D|1020
I would like to convert this to the following:
INSEE | VALUE_SPREAD
A|24.5
B|24.5
C|100
D|50
I can achieve this with a nested SQL query (through counting the
number of POSTAL that belong to any given INSEE, and diving the value
of the postal in that INSEE by
2008 Apr 10
3
option_groups_from_collection_for_select with a ActiveRecord::Base single object
Rails documentation gives examples of using
option_groups_from_collection_for_select with two tables/objects.
How could it be done with one?
Example that almost works:
I have a form to enter address from both the United States and Canada.
It has the following:
====new.html.erb====
<%= select_tag(
:state,
option_groups_from_collection_for_select(
State.countries,
:country,
2006 Jul 14
1
auto completion with composite field
How can auto completion be done for a composite field ?
Concrete problem : Suppose the class Person with reference to a City
object.
The City has a name and a postal code.
When entering a Person I want to enter the city in one text field that
shows a composition of the city name and the postal :
"city (postal)". And this with auto complete (and should afterwards be
linked to the
2011 Dec 18
1
maptools/spatial analysis question
Hi,
I am using maptools to plot air quality data on a map. Each measurement point is mapped to a postal code area. This yields pictures with discrete borders, like so:
http://dl.dropbox.com/u/27415200/baincome.png
The problem is that the size of a postal code area doesn't mean much in this context. Moreover, only a small minority of all the postal code areas has a measurement sation. Are
2018 Jan 18
8
reading lisp file in R
Dear friends,
Is there a way to read data files written in lisp into R?
Here is the file: https://archive.ics.uci.edu/ml/machine-learning-databases/university/university.data
I would like to read it into R. Any suggestions?
Thanks very much in advance for pointers on this and best wishes,
Ranjan
--
Important Notice: This mailbox is ignored: e-mails are set to be deleted on receipt. Please
2012 Nov 08
4
Accessing selected elements of a list
Hi,
If I have a vector:
junk <- c(2,0,0,3,0)
and want to access, say, all the elements that are greater than zero. I just do:
junk[which(junk>0)]
Now, If I have a list:
jlist <- list(NULL,c(1,0),NULL,c(1,2,3), NULL)
and want to access all the elements that have length greater than zero, I know how to find the elements with:
which(sapply(jlist,length)>0)
But how do I get a
2018 Mar 30
3
getting all circular arrangements without accounting for order
Thanks!
Yes, however, this seems a bit wasteful. Just wondering if there are other, more efficient options possible.
Best wishes,
Ranjan
On Thu, 29 Mar 2018 22:20:19 -0400 Boris Steipe <boris.steipe at utoronto.ca> wrote:
> If one is equal to the reverse of another, keep only one of the pair.
>
> B.
>
>
>
> > On Mar 29, 2018, at 9:48 PM, Ranjan Maitra
2013 Jan 06
4
random effects model
Hi A.K
Regarding my question on comparing normal/ obese/overweight with blood
pressure change, I did finally as per the first suggestion of stacking the
data and creating a normal category . This only gives me a obese not obese
14, but when I did with the wide format hoping to get a
obese14,normal14,overweight 14 Vs hibp 21, i could not complete any of the
models.
This time I classified obese=1
2006 Apr 19
9
geolocation db?
I''m currently planning a social app in Rails that relies on being able to
see how far you are from everyone else.
It''s my intention to store rough geo-coordinates as part of the sign up
process. My intention is to capture their zipcode or postal code, and then
be able to query a webservice once for that data. It''s also possible that
there might be a database or even
2018 Mar 30
0
getting all circular arrangements without accounting for order
I don't know if this is more efficient than enumerating with distinct
directions and weeding... it seems kind of heavyweight to me:
#######
library(gtools)
directionless_circular_permutations <- function( n ) {
v <- seq.int( n-1 )
ix <- combinations( n-1, 2 )
jx <- permutations( n-3, n-3 )
x <- lapply( seq.int( nrow( ix ) )
, function( i ) {
2018 Mar 30
2
getting all circular arrangements without accounting for order
Jeff,
I wanted to let you know that your function is faster than generating the directional circular permutations and weeding.
Here is the time for n = 10. I compared with just doing the permutations, there is no point in proceeding further with the weeding since it is slower at the start itself.
system.time(directionless_circular_permutations(10))
user system elapsed
1.576 0.000
2006 Jan 18
6
Autocomplete related fields
I have a table that has city, state and postal code. I want to
auto-fill the city and state when a postal code is entered.
The city and postal code are simple text fields, but the state is a
drop-down list with abbreviations as the value, and the full state
name as the option text.
I assume with Ajax.Updater I could just return the HTML for both the
city and state fields -- including the entire
2012 Jul 26
4
Variables in a Tabular form. easily saved in a txt file
Dear all,
I would like to save few variable-names with their values in a tabular form, with that I mean
that files can be printed easily in R in a tabular form and also saved in a ascii file that when one opens it see also the variables in a nice tabular format.
IS that possible? Below a small example of how should look results in R and in a txt file.
Postal Code | Superb
2008 Nov 05
4
select in form - best practice?
Q. What resource do readers recommend for referencing regarding best
practices for form construction in Rails?
I have the following situation: location_type of Locations may have one
of five (5) possible codes. Presently I have these codes listed in a
drop-down select constructed thusly:
<p>
<b>Location type</b><br />
<%= f.select :location_type,
2018 Mar 30
0
getting all circular arrangements without accounting for order
New function below is a bit faster due to more efficent memory handling.
for-loop FTW!
directionless_circular_permutations2 <- function( n ) {
n1 <- n - 1L
v <- seq.int( n1 )
ix <- combinations( n1, 2L )
jx <- permutations( n-3L, n-3L )
jxrows <- nrow( jx )
jxoffsets <- seq.int( jxrows )
result <- matrix( n, nrow = factorial( n1 )/2L, ncol = n )
k
2003 Sep 22
3
Fwd: privsep in ssh
It was suggested to me that I forward this message to you.
---------- Forwarded Message ----------
Subject: privsep in ssh
Date: Fri, 19 Sep 2003 12:22
From: Russell Coker <russell at coker.com.au>
To: SE Linux <selinux at tycho.nsa.gov>
Cc: Colin Watson <cjwatson at debian.org>
#ifdef DISABLE_FD_PASSING
if (1) {
#else
if (authctxt->pw->pw_uid == 0 ||
2006 Aug 18
1
dovecot vs qpopper performance testing results
Hi,
I did some performance testing with dovecot and qpopper, if anyone is
interested..
Hardware: Dual Xeon 2.8 with HT enabled (dmesg sees 4 cpu-s), 1 GB RAM,
SCSI RAID 1 with 2x Maxtor Atlas 10K V disks.
Software: CentOS 4.3, Qpopper 4.08 in standalone mode vs Dovecot
1.0-0_19.rc6, ext3 filesystem
Mailbox format Mbox, tested Pop3 with PAM authentication
My setup had 15 test users with 15
2018 Mar 30
3
getting all circular arrangements without accounting for order
Dear friends,
I would like to get all possible arrangements of n objects listed 1:n on a circle.
Now this is easy to do in R. Keep the last spot fixed at n and fill in the rest using permuations(n-1, n-1) from the gtools package.
However, what if clockwise or counterclockwise arrangements are the same? I know that half of the above (n - 1)! arrangements are redundant.
Is there an easy way to
2018 Jan 18
0
reading lisp file in R
> On Jan 17, 2018, at 8:22 PM, Ranjan Maitra <maitra at email.com> wrote:
>
> Dear friends,
>
> Is there a way to read data files written in lisp into R?
>
> Here is the file: https://archive.ics.uci.edu/ml/machine-learning-databases/university/university.data
>
> I would like to read it into R. Any suggestions?
It's just a text file. What difficulties