Displaying 8 results from an estimated 8 matches for "demec".
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2017 Dec 27
2
Numerical stability in chisq.test
The chisq.test on line 57 contains following code:
STATISTIC <- sum(sort((x - E)^2/E, decreasing = TRUE))
However, based on book "Accuracy and stability of numerical algorithms" available from:
http://ftp.demec.ufpr.br/CFD/bibliografia/Higham_2002_Accuracy%20and%20Stability%20of%20Numerical%20Algorithms.pdf
Table 4.1 on page 89, it is better to sort the data in increasing order than in decreasing order, when the data are non-negative.
An example:
x = matrix(c(rep(1.1, 10000)), 10^16, nrow = 10001, ncol...
2017 Dec 28
0
Numerical stability in chisq.test
...look strange, but seems to be
## a sensible way to deal with rounding issues (PR#3486):
STATISTIC <- sum(sort((x - E) ^ 2 / E, decreasing = TRUE))
-k
> However, based on book "Accuracy and stability of numerical algorithms" available from:
> http://ftp.demec.ufpr.br/CFD/bibliografia/Higham_2002_Accuracy%20and%20Stability%20of%20Numerical%20Algorithms.pdf
> Table 4.1 on page 89, it is better to sort the data in increasing order than in decreasing order, when the data are non-negative.
> An example:
> x = matrix(c(rep(1.1, 10000)), 10^16, nrow...
2004 Dec 01
1
Ethernet bridges + udev problem?
...----
I''d like to know if this is something to worry about or
if I should start looking for something else.
I''m running Xen 2.0, with a Fedora Core 3 Domain0, and
(trying to) connecting to a Gentoo Unpriviledged Domain.
Many thanks!
--
Ramiro Brito Willmersdorf rbw@demec.ufpe.br
Departamento de Eng. Mecânica UFPE
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2017 Dec 27
0
Numerical stability in chisq.test
The chisq.test contains following code:
STATISTIC <- sum(sort((x - E)^2/E, decreasing = TRUE))
However, based on book Accuracy and stability of numerical algorithms <http://ftp.demec.ufpr.br/CFD/bibliografia/Higham_2002_Accuracy%20and%20Stability%20of%20Numerical%20Algorithms.pdf> Table 4.1 on page 89, it is better to sort the data in increasing order than in decreasing order, when the data are non-negative.
A demonstrative example:
x = matrix(c(rep(1.1, 10000)), 10^16, nro...
2010 Apr 29
2
Encrypting files in Rails
So far the tutorials I''ve seen are for encrypting text and then
decrypting it back.
So for example you have a
plaintext = "some text"
you encrypt it and then you decrypt it depending on how you encrypted
it.
What I am looking for is to encrypt a whole file and then store it.
for example I allow my users to upload .doc/.xls files. I want to
encrypt those files so I would not
2017 Dec 28
1
Numerical stability in chisq.test
...cts equivalent tables in the same way. "Fixing" the code may therefore unfix PR#3486; at the very least some care is required if this is modified.
-pd
>
>> However, based on book "Accuracy and stability of numerical algorithms" available from:
>> http://ftp.demec.ufpr.br/CFD/bibliografia/Higham_2002_Accuracy%20and%20Stability%20of%20Numerical%20Algorithms.pdf
>> Table 4.1 on page 89, it is better to sort the data in increasing order than in decreasing order, when the data are non-negative.
>
>> An example:
>> x = matrix(c(rep(1.1, 100...
2010 Jan 25
3
Dynamic attributes!
I want to create a general model ''Product'' that I will be able to
store several attributes in it.
For example the attributes
:id
:name
:description
are pretty stantard. So each product will have this attributes.
However, I wanted to know if it is possible to create dynamic
attributes.
In the case of a cell phone device I might want to store the IMEI of
the phone, this
2009 Apr 28
0
Radio buttons in forms
<% form_for @group do |g| %>
To create a new group please complete the details below
<p>
<label> Group Name </label>
<%= g.text_field :name %>
</p>
<p>
<label> Public </label>
<%= g.radio_button :type, "public" %>
<label> Private </label>
<%=