Displaying 20 results from an estimated 1000 matches similar to: "sampling"
2011 Jun 03
1
VLOOKUP in R - tried everything.
I am attempting to emulate the VLOOKUP function from Excel in R.
I want to compare one column (coll.minus.release) with another
(release.days) to get the number of parasitoid released at that time
(TotalParasitoids).
for example:
coll.minus.release release.days ParasitoidTotal
-12 -266 1700
8 -259 1000
8
2010 Jul 06
4
Adding two files into one and vlookup
I have two files with dates and prices in each. The number of rows in each of
them will differ. How do I create a new file which contains data from both
these files? Cbind and merge are not helpful. For cbind because the rows are
not the same replication occurs. Also if I have similar data how do I write
a vlookup kind of function? I am giving an example below:
Say Price1 file contains the
2009 Feb 19
2
Use of ifelse for indicating specific rownumber
Hello
I have a dataset named "b2" with 1521 rows, in that dataset i have 64 rows
containing specific information.
the rownumbers with specific info are:
+ i
[1] 22 53 104 127 151 196 235 238 249 250 263 335 344 353
362 370 389 422 458 459 473 492 502 530 561 624 647 651 666
671
[31] 715 784 791 807 813 823 830 841 862 865 1036 1051 1062 1068
2012 Feb 28
4
vlookup type function
Hi
I''m looking for an Excel Vlookup type function in R.
Example:
list <- c(1,2,3,4,5,6,7)
base <- c(2.2,3,5.2)
What I want is, for each number in base, the highest value in list,
which is equal to or less than the number in base
So the results would be:
base ? ? ? ? list
2.2 ?------> 2
3 ? ?------> 3
5.2 ?------> ?5
Thanks for your help!
2008 Mar 24
6
vlookup in R
Hi,
Is there are function similar to excel vlookup in R. Please let me know.
Thanks,
Sachin
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2005 Sep 26
3
How to get the rowindices without using which?
Hi,
I was wondering if it is possible to get the
rowindices without using the function "which" because
I don't have a restriction criteria. Here's an example
of what I mean:
# take 10 randomly selected instances
iris[sample(1:nrow(iris), 10),]
# output
Sepal.Length Sepal.Width Petal.Length Petal.Width
Species
76 6.6 3.0 4.4 1.4
2010 Feb 22
2
vloopkup or search function
Hi,
Does R has something similar to vlookup function in excel?
Thank you for the info.
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2010 May 28
4
vlookup in R?
Hi R-users,
I would like to search for the values of seq that match my rand values. In excel I will use =VLOOKUP(G2,$E$2:$F$32,2). For example, for rand=.262 it will give me approximately seq=120 and rand=0.964293344, seq=460 and etc.
E F G
cdf seq rand
0.00E+00 0 0.262123478
1.56E-03 20 0.964293344
1.55E-02 40 0.494827113
5.30E-02 60
2003 Sep 02
1
package xtable
Hi,
How can I avoid xtable of printing rownumbers when exporting a
data.frame ?
Are there more packages that deal with LaTeX besides xtable and Sweave ?
Thanks
EJ
2010 Nov 08
2
lookup in R - possible to avoid loops?
Hello!
Hope there is a nifty way to speed up my code by avoiding loops.
My task is simple - analogous to the vlookup formula in Excel. Here is
how I programmed it:
# My example data frame:
set.seed(1245)
my.df<-data.frame(names=rep(letters[1:3],3),value=round(rnorm(9,mean=20,sd=5),0))
my.df<-my.df[order(my.df$names),]
my.df$names<-as.character(my.df$names)
(my.df)
# My example lookup
2007 May 10
3
Quick question on merging two time-series of different frequencies
Hi,
A quick beginner's question. I have two time series, A with
daily data, and another B with data at varying frequencies, but mostly
annual. Both the series are sorted ascending.
I need to merge these two series together in the following way: For any
entry of A, the lookup should match with B until we find an entry of B
that's larger than A's.
For all A[i], i = 1,...,N and B[j],
2012 Feb 24
6
strange behaviour of "POSIXlt" "POSIXt" object
Hi,
Does anybody know why get I this kind of strange situation:
Browse[2]> hcEnd
[1] "2009-03-29 06:30:00"
Browse[2]> class(hcEnd)
[1] "POSIXlt" "POSIXt"
Browse[2]> is.na(hcEnd)
[1] TRUE
This issue is the source of my all issues in my program,
Thanks for your help
--
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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
2011 May 18
4
Loop stopping after 1 iteration
Hi all,
This is a very basic question, but I just can't figure out why R is handling
a loop I'm writing the way it is.
Here is the script I have written:
grid_2_series<-function(gage_handle,data_type,filename)
series_name<-paste(gage_handle,data_type,sep="_")
data_grid<-read.table(file=paste(filename,".txt",sep=""))
2006 Jan 25
4
Cannot :order when using :offset and :limit in find
Hello all.
I am using the Paginate_with_ajax code as described on the wiki but I am
running into the following problem. The following code will work fine
and retrieved unsorted records in a hunky dory fashion:
@componentlogs = Componentlog.find(:all,
:conditions => [ "cl_compname like ?", @criteria ],
:offset => offset,
:limit => items_per_page )
However if I try and add an
2006 Jan 26
1
Help constructing a find_by_sql command
Hello all. I am trying to do the equivalent of:
@componentlogs = Componentlog.find(:all,
:conditions => [ "cl_compname like ?", @criteria ],
:offset => offset,
:limit => items_per_page,
:order => "cl_spr DESC" )
in a find_by_sql statement. I cannot use the build in because the
adaptor isn''t quite right (OCI8)
When I use it I get the following error
2006 Jul 04
1
[Fwd: formatting using the write statement]
>I have a series of write statements because
>i am writing to a file
>where the characters strings are the column names of a dataframe
>and the numbers are the elements in a particular row.
>So, a file might look like
>
>AAA 2.1
>BB 3.1
>AHLZ 0.2
>
>and it would be named "rowname".mls.
>
>so, each time i get to a new row, i create a new file and
2011 Jun 23
2
Confidence interval from resampling
Dear R gurus,
I have the following code, but I still not know how to estimate and extract
confidence intervals (95%CI) from resampling.
Thanks!
~Adriana
#data
penta<-c(770,729,640,486,450,410,400,340,306,283,278,260,253,242,240,229,201,198,190,186,180,170,168,151,150,148,147,125,117,110,107,104,85,83,80,74,70,66,54,46,45,43,40,38,10)
x<-log(penta+1)
plot(ecdf(x),
2006 Jul 06
4
Oracle HR on Rails
Interesting read...apologies if it has been posted already.
http://www.oracle.com/technology/pub/articles/saternos-rails.html
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2011 Apr 04
1
moving mean and moving variance functions
Hello
Lets say as an example I have a dataframe with the following attributes:
rownum(1:405), colnum(1:287), year(2000:2009), daily(rownum x colnum x year)
and foragePotential (0:1, by 0.01). The data is actually stored in a netcdf
file and I'm trying to provide a conceptual version of the data.
Ok. I need to calculate a moving mean and a moving variance for each cell on
the following