Displaying 20 results from an estimated 300 matches similar to: ""Conditional" match?"
2006 Jan 03
2
For loop gets exponentially slower as dataset gets larger...
I am running R 2.1.1 in a Microsoft Windows XP environment.
I have a matrix with three vectors (“columns”) and ~2 million “rows”. The three vectors are date_, id, and price. The data is ordered (sorted) by code and date_.
(The matrix contains daily prices for several thousand stocks, and has ~2 million “rows”. If a stock did not trade on a particular date, its price is set to “NA”)
2006 Nov 04
2
sql query in active record
hi all,
if i want to write a query select * from a,b where a.b_id=b.id in active
record
using joins,condition how can i write that
in docs i found for conditions you do by giving "?" and then the parameter
eg. a.b_id=?
but it takes b.id as string i.e a.b_id=''b.id''
i dont want that
any suggestions
thanks in advance
regards
gaurav
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2006 Mar 29
2
aggregate function....
Dear R users,
I have some trouble with the aggregate function. Here are my data
> daf
S_id AF_Class count... R_gc_percent S_length
5 8264497 1 30 0.48 35678
6 8264497 3 7 0.48 35678
8 8264554 1 31 0.51 38894
9 8264554 2 11 0.51 38894
10 8264554 3 1 0.51 38894
2011 Apr 11
4
Printing field attributes outside the model.find_by_sql
Hi All,
I have Model called pays..and it has fields like(id, topic, subject,
created_at, b_id) and i also have a Model called suggests with
fields(id, income, price, b_id)
In my ruby on rails action or method Controller:
def print_two_table
@p = Pay.find_by_sql("SELECT p.id, p.topic, s.id, s.income, s.price FROM
pays as P LEFT OUTER JOIN suggests AS s ON s.b_id = p.b_id WHERE
2010 Jun 09
3
Extracting Elements By Date
Dear R Gurus,
Thanks for any help in advance!
Date.frame: Returns.names
X id ticker date_ adjClose totret RankStk
258060 258060 13645T10 CP 2001-06-29 18.125 1877.758
My data frame is in the above format. I would like to filter by period, per
id (every 125 days) each consisting of 250 days, I.e. 1-250, 126-375, etc.
One important thing to note is that not all
2006 Dec 30
2
search on multiple table
Hello,
I am trying to make a search, using acts_as_ferret on a
has_and_belongs_to_many relation :
class a < ActiveRecord::Base
belongs_to :b
has_and_belongs_to_many :c
Joboffer.find_by_contents( query +b_id:1 ) is working fine
but
Joboffer.find_by_contents( query +c:1 ) is not working
Here are the tables descriptions:
Table a have field : id, b_id
Table b have field : id,
2006 Feb 28
4
multiple keys table
probablly a newbie question:
Rails does not support a table with multiple keys ???
it seems that the ActiveRecord set_primary_key method can only set the
column name... (hope i''m wrong there)
example:
table A - P.K id, string name
table B - P.K id, string name
table C - P.K a_id and b_id, both are also foreign keys.
Thanks,
Amir.
--
Posted via http://www.ruby-forum.com/.
2012 Apr 03
3
[PATCH] Btrfs: do not mount when we have a sectorsize unequal to PAGE_SIZE
Our code is not ready to cope with a sectorsize that''s not equal to PAGE_SIZE.
It will lead to hanging-on while writing something.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
---
fs/btrfs/disk-io.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 20196f4..b9866f2 100644
--- a/fs/btrfs/disk-io.c
+++
2006 May 17
2
Association data clobbering (foreign keys too?)
Can someone please confirm or correct the following statements?
If I have the following tables
create table as (id int, [...], b_id int);
create table bs (id int, [...], a_id int);
create table as_bs (a_id int, b_id int);
and the associations woould be defined like this
class A << ...
habtm :bs
belongs_to :b
end
so my Model A has a habtm collection of Bs *plus* a direct
2005 Oct 11
6
adding 1 month to a date
Within an R dataset, I have a date field called “date_”. (The dates are in the format “YYYY-MM-DD”, e.g. “1995-12-01”.)
How can I add or subtract “1 month” from this date, to get “1996-01-01” or “ “1995-11-01”.
---------------------------------
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2010 Jun 07
3
Subsetting subsets of data.frames
Hey Everyone,
I have been stumped by this all day.
Basically, I have a data.frame of multiple columns. Of concern are "id" &
"date"
For some reason, oftentimes there are duplicates of data with the same date.
I would like to remove the duplicates per different id (removing duplicate
dates for the entire data.frame would leave nothing since different id's all
have
2008 Jul 04
2
How to make WHERE foo_id IN () query?
Hi,
There are 3 models:
A has_many :Cs
B has_many :Cs
C belongs_to A and B
I got a single object of A and an array of B objects. How can I get
all Cs that have a_id equal to object A.id *and* b_id that belongs to
an object in Bs array?
Regards
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2012 Nov 28
2
data frame: adding columns from data and file title
Data processing?
I have a large number of csv files from animal tracks that look like this:
Date_ Time_ Speed
Course Type_ Distance
30/03/2012 11:15:05 108
121 -2
2013 Jul 19
12
Rails 4 "belongs_to: record" association doesn't work
Hi,
I discovered a weird behavior when using a "belongs_to: record" association
in Rails 4.
Given two models A and B:
class A < ActiveRecord::Base
belongs_to :record, class_name: ''B'', foreign_key: ''b_id''
end
class B < ActiveRecord::Base
end
When creating A, it inserts a record in B and returns A with id of nil:
irb(main):001:0>
2018 Mar 25
1
Get Specific Records from Another DataFrame
Hello
I have been struggling with this simple looking problem. I have two
dataframes. The first one contains ID, date, and revenue information for
specific suppliers.
id lastdate depvar
A 5/10/2017 10
B 8/16/2017 20
C 2/14/2017 30
D 9/5/2017 40
E 8/1/2017 50
F 11/4/2017 60
G 6/22/2017 70
The second dataframe contains timeseries data of each supplier in different
columns. For example Column A are
2013 Nov 05
1
ocfs2: why not set EROFS when clearing bits multiple times
In ocfs2_block_group_clear_bits, when num_bits != bits_cleared, it just
log an error message without setting EROFS.
The code is below:
/*
* If encountered, it means we are clearing bits multiple times. While
* we are handling the case, we still need to be alerted to its
* occurrence. Hence, marking it as an ERROR and not NOTICE.
*/
if (num_bits != bits_cleared) {
mlog(ML_ERROR,
2010 Jun 08
1
Filtering out a data.frame
Sample Data.Frame format
Name is Returns.nodup
X id ticker date_ adjClose totret RankStk
427225 427225 00174410 AHS 2001-11-13 21.66 100 1235
"id" uniquely defines a row
What I am trying to do is filter out id's that have less than 1500 data
points (by date)
First, I used
total<-by(Returns.nodup, Returns.nodup$id,nrow)
which subsetted by
2006 Mar 15
1
push_with_attributes not inserting default values
I have a join table A_B with columns[a_id, b_id, c_data default 1,
d_data default 1].
If I do:
@aobj.bobjs.push_with_attributes(@bobj,{:c_data => 0})
I find that the row inserted, has d_data set to 0 and not the default
value specified in the database, which is 1. So I am having to
explicitly set it using :
@aobj.bobjs.push_with_attributes(@bobj,{:c_data => 0, :d_data => 1}).
Is this
2016 Jun 20
1
rsync script for snapshot backups
The scripts I use analyze the rsync log after it completes and then
sftp's a summary to the root of the just completed rsync.
If no summary is found or the summary is that it failed, the folder
rotation for that set is skipped and that folder is re-used on the
subsequent rsync.
The key here is that the folder rotation script runs separately from the
rsync script(s).
For each entity I want
2010 Jun 04
5
R Newbie, please help!
Hello Everyone,
I just started a new job & it requires heavy use of R to analyze datasets.
I have a data.table that looks like this. It is sorted by ID & Date, there
are about 150 different IDs & the dataset spans 3 million rows. The main
columns of concern are ID, date, and totret. What I need to do is to derive
daily returns for each ID from totret, which is simply totret at time