Displaying 13 results from an estimated 13 matches similar to: "How to find all single minima, i.e. only each one within each next part of analyzed vector (table)"
2012 Dec 12
1
Subset of Data
Hi Arun,
I have a question about choosing a subset of data.
I have a matrix of 5000 in 3500.
I want to choose specific variables such as proc1 to proc1000 and Lab1 to Lab1600 and put it into a new matrix to run some correlation analysis.
Since I have 3500 variables, I don't know from what column my lab or procedures start.
I really appreciate your help.
Thanks.
Best,Farnoosh Sheikhi
2009 Apr 23
0
problems using smbpasswd to enable/disable workstations trusted accounts
Greetings,
My name is Alceu and I was trying to create some scripts to
enable/disable users when I found this strange behavior with the account
flags:
# please assume that the Unix user is already created
root@midgard:~# smbpasswd -a -m lab16$
Added user lab16$.
root@midgard:~# pdbedit -Lv lab16$
Unix username: lab16$
NT username:
Account Flags: [W ]
...
root@midgard:~#
2013 Mar 20
0
unexpected local minima/maxima with surf.gls
Hi there,
I use the surf.gls() function to fit a variable measured over a surface. When I plot the predicted surface, there are local minima/maxima in almost every coordinate where data were measured, which seems aberrant. For instance:
?? x <- c(343,293,343,243,293,343,443,543,593,243,293,343,393,443,493,543,593,143,193,243,293,343,393,443,
2005 Jun 15
1
Finding local minima and maxima
I have data in the form of (x,y) pairs and would like to find local
minima and maxima (typically the zeros of the 2nd derivative) of the y
values. I looked at numericDeriv, but I don't have an "expression" per
se. I looked at optim, also, but it looks like it will find only one
"global" max or min. I can code up my own piecewise derivatives, but
wondered if there is
2011 May 25
0
approximate function and find local peaks (Maxima or Minima)
Hi,
I have a data-matrix:
> CB
Zeit Low
2 2011-05-02 08:05:05 7596.0
3 2011-05-02 08:10:06 7593.5
4 2011-05-02 08:15:11 7594.5
5 2011-05-02 08:20:15 7597.5
6 2011-05-02 08:25:18 7595.0
7 2011-05-02 08:30:20 7593.5
8 2011-05-02 08:35:21 7593.0
9 2011-05-02 08:40:21 7593.0
10 2011-05-02 08:45:25 7599.0
11 2011-05-02 08:50:34 7596.0
12
2005 Nov 11
1
optim not giving correct minima
Hello,
I am trying to use optim() on a function involving a summation. My
function basically is a thinned poisson likelihood. I have two parameters
and in most cases optim() does a fine job of getting the minima. I am
simulating my data based on pre specified parameters, so I know what I
should be getting. However when my true parameters fall in a particular
range, optim() gives
2002 Sep 29
2
Problem on minima
2009 Nov 03
2
1 dimensional optimization with local minima
I am using numerical optimization to fit a 1 parameter model, in which the
input parameter is bounded. I am currently using optimize(), however, the
problem turns out to have local minima, and optimize does not always seem to
find the global minimum. I could to write a wrapping function that tries
multiple intervals or starting values, but I would prefer a package that has
built-in methods to make
2005 Nov 24
0
Safari document.getElementByClassName problem
Hi,
I am having a problem under safari with the above mentioned method.
In my example document I have something like the following:
<div id="label_2" class="lab15">Q1</div>
<div id="label_6" class="lab15">Q1</div>
<div id="label_10" class="lab15">Q1</div>
<div id="label_14"
2007 Sep 10
1
persp() problem
I am having some trouble getting the persp() package to change the x
and y axis on a 3d plot. It defaults to the [0,1] interval and when I
try to change it I get errors.
Example:
This works:
------------
D <- c(1,2,3,4,5,6,7,8,9,10)
M <- c(11,12,13,14,15,16,17,18,19,20)
DM <- cbind(D,M)
persp(DM, theta = 40, phi = 30, expand = 0.5, col = "lightblue",
ltheta = 120,
2009 Apr 26
2
Help to select the raw in a data.frame with the max value
Dear User,
thank for the attention. I have a data.frame with 5 columns (ex:ID,
a1,a2,a3,a4) and 1000 rows. I wish to find the absolute max value for all
data.frame and save a new data.frame with the row where is that value. Ex:
ID: 1,2,3,4,5,6,7,8,9,10
a1:1,2,3,4,5,6,7,8,9,10
a2:11,12,13,14,15,16,17,18,19,20
a3:21,22,23,24,25,26,27,28,29,30
a4:31,32,33,34,35,36,37,38,39,40
The
2011 Jul 01
2
regexp problem
Hi
I have a question concerning regexp - I want to select with grep all
character strings which contain the numbers 11:20 (code below).
At the moment I am using [], but that obviously does not work, as it matches
each element in the []. Is there a way to specify that the regexp should
match 11, but not 1?
Here is the code code:
x <- paste("suff", 1:40, "pref",
2007 May 23
13
Preparing to compare Solaris/ZFS and FreeBSD/ZFS performance.
Hi.
I''m all set for doing performance comparsion between Solaris/ZFS and
FreeBSD/ZFS. I spend last few weeks on FreeBSD/ZFS optimizations and I
think I''m ready. The machine is 1xQuad-core DELL PowerEdge 1950, 2GB
RAM, 15 x 74GB-FC-10K accesses via 2x2Gbit FC links. Unfortunately the
links to disks are the bottleneck, so I''m going to use not more than 4
disks, probably.