Z[f] would return the fth values in z. That is, if f = c(1,2) z[f] would return
the first and second elements of z. The original intent was to obtain the
indices in z corresponding to the values in f.
Barth
-Original Message-
From: r-help-boun...@r-project.org
Dear list
Despite having set color settings for the console and script editing window,
when I open R and open a script file the text is black against a black
background (should be, according to the rconsole colors I saved, yellow against
black). I have tried repeatedly to reload and reapply
Hello
I have a matrix (though it could also be a ragged array) called items.used,
that has the item numbers of questions administered to a set of respondents. I
also have a vector of item parameters called b[]. I am looking for an elegant
way to create a matrix b.mat in which each element is
Thank you Phillip for your post. I am reading in:
1. a 3 x 100 item parameter file (floating point and integer data)
2. a 100 x 1000 item response file (integer data)
3. a 6 x 1000 person parameter file (contains simulation condition information,
person measures)
4. I am then computing several
Thanks Martin, this is very helpful.
Barth
-Original Message-
From: Martin Morgan [mailto:mtmor...@fhcrc.org]
Sent: Thursday, April 14, 2011 11:04 AM
To: Barth B. Riley
Subject: Re: [R] for loop performance
On 04/14/2011 07:12 AM, Barth B. Riley wrote:
Hi Martin
Question--when
Dear list
I am running some simulations in R involving reading in several hundred
datasets, performing some statistics and outputting those statistics to file. I
have noticed that it seems that the time it takes to process of a dataset (or,
say, a set of 100 datasets) seems to take longer as
Dear list
I want to know if there is a function in R that enables one to create a new
matrix based on values in an existing matrix, whereby each column in the new
matrix is a row-specific summary (e.g., sum, mean) of multiple columns in the
original matrix. For instance, to take a 12-column
Dear list
I am trying to figure out how to create a ragged array that consists of groups
of array elements (indices from the original array) of similar values. I would
like to create a ragged array that might look something like this:
S[1]
11, 19, 14,7
S[2]
29,4,1,13,44
S[3]
56,9,2,35
S[4]
Hello
I would like to obtain the coefficients for a quadratic function (ax^2 + bx +
c) given three sets of points on the quadratic curve. For instance:
Y X
0.1595290
0.5 0.773019
1 1
Is there a function in R to
Thanks Josh and David
Barth
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Hello
Is there a straightforward way of getting a vector containing the minimum (or
maximum) value of each row of a matrix?
Thanks
Barth
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Dear list
I am calling the functiton bugs() provided by R2WinBugs to performs an IRT
analysis. The function returns a set of estimated parameters over n
replications/iterations. For each replication, two sets of person measures
(theta1 and theta2) and two sets of item difficulty parameters
Dear list
I am interested n developing a graph using plot() and text() commands in which
several text strings will be placed within the plot area I would like some way
to get the size (width and height), either in pixels or using the plot's
coordinate system, of text strings, based on the
Dear all
I am trying to use the cov function in the stats library. I have no problem
using this function from the console. However, in my R script I received a
function not found message. Then I called stats::cov(...) and received an
error message that the function was not exported. Then I
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