Displaying 20 results from an estimated 178 matches similar to: "Find maxima of a function"

2017 Aug 26

1

Find maxima of a function

Please keep the list in cc.
Sorry, it didn't work as expected. Maybe someone else have an appropriate
solution.
Best,
Ulrik
On Sa., 26. Aug. 2017, 12:57 niharika singhal <niharikasinghal1990 at gmail.com>
wrote:
> Hi
>
> Thanks for you mail,
> I really appreciate your time on my problem
>
> I have posted this problem on
>
>
>

2017 Aug 26

2

Fwd: Find maxima of a function

Hi,
Thanks for your mail, and time
It is not working for some arguments, when mean value is like >6.
case
mc0 <- c(0.08844446,0.1744455,0.1379778,0.1209769,0.1573065,0.
1134463,0.2074027)
rv <-UnivarMixingDistribution(Norm(486.4255, 53.24133),
Norm(664.0713, 3.674773),
Norm(669.0484, 4.101381),

2017 Aug 24

1

Problem in optimization of Gaussian Mixture model

Hello,
I am facing a problem with optimization in R from 2-3 weeks.
I have some Gaussian mixtures parameters and I want to find the maximum in
that
*Parameters are in the form *
mean1 mean2 mean3 sigma1 sigma2 sigma3 c1 c2 c3
506.8644 672.8448 829.902 61.02859 9.149168 74.84682 0.1241933
0.6329082 0.2428986
I have used optima and optimx to find the

2017 Aug 27

1

Fwd: Find maxima of a function

Dear Niharika,
As I said before, the problem is basically an optimization issue. You should isolate the problematic part from the rest of your study. Sometimes, more information does not help to solution. All the answers from us (Ulrik, David, me) are more or less are correct to find a maximum point. Newton?s method is also correct. But after answers, you only say, it didn?t find the right

2017 Aug 27

1

Fwd: Find maxima of a function

---------- Forwarded message ----------
From: niharika singhal <niharikasinghal1990 at gmail.com>
Date: Sun, Aug 27, 2017 at 11:57 AM
Subject: Re: Find maxima of a function
To: "David Winsemius [via R]" <ml+s789695n4745009h56 at n4.nabble.com>,
"Ismail SEZEN [via R]" <ml+s789695n4744993h60 at n4.nabble.com>, Ulrik Stervbo
<ulrik.stervbo at gmail.com>

2017 Aug 27

1

Fwd: Find maxima of a function

I have not followed the history of this thread, but I am quite flummoxed as to why the OP is rewriting code to estimate parameters from an univariate Gaussian mixture model when alternatives such as EMCluster (which generally appears to handle initialization better than MClust) exist. Or perhaps there is more to it in which case I apologize. But I thought that I would make the OP aware of the

2017 Aug 26

1

Find maxima of a function

> On 26 Aug 2017, at 16:39, niharika singhal <niharikasinghal1990 at gmail.com> wrote:
>
> Hi,
>
> Thanks for your mail, and time
>
> It is not working for some arguments, when mean value is like >6.
>
>
> case
>
> mc0 <- c(0.08844446,0.1744455,0.1379778,0.1209769,0.1573065,0.
> 1134463,0.2074027)
>
> rv

2008 Feb 21

1

Finding local maxima (height) in a matrix data (6 spatial coordinates)?

Dear all,
I wonder which R algorithm could perform a search of local maxima in
an spatial grid, in other words, having the coordinates of a map
(x,y,z... up to 6 coordinates) and then the altitude/height at each
point (h) (in total 7 numerical variables) I would like to localise
the peaks (local maxima) of that topological surface. Which R
algorithm can perform this?
Thanks a lot,
Josep

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,

2007 Nov 19

0

Using density() and turnpoint to Identify maxima in data

Hi
I have a large dataset which follows a multimodal distribution. And I
would like to identify the maxima. As the data is obtained from a
stochastic simulation, not all maxima in the data are "real maxima of
the dirstribution" but rather small random fluctuations. Unfortunately,
it is not possible for me to run more simulations to smooth the obtained
distribution.
What I am doing

2004 May 28

0

MAXIMA - Hitelesítés a(z) hihetetlen csoportban

?dv?z?lj?k az Egyperces olvas?inak t?bor?ban!

2017 Aug 28

1

"Improvement with the R code"

Chuck (Is it fine to call you Chuck?) has far more R jutsu than I do
obviously.
I don't know much about pmin and factor but it might worth looking into if
you want to manipulate states by names (I assume this is why one might want
to use it?)
generate_transition_matrix <- function(data, states)
prop.table(table(head(data, -1), tail(data, -1)), 1)[states,]

2017 Aug 22

2

Rounding of problem with sum command in R

Hello I have a vector
v=c(0.08844446,0.1744455,0.1379778,0.1209769,0.1573065,0.1134463,0.2074027)
when i do
sum(v)
or
0.08844446+0.1744455+0.1379778+0.1209769+0.1573065+0.1134463+0.2074027
i am getting output as 1
But if i add them manually i get
1.00000026
I do not want to round of my value since it effect my code further
Can anyone suggest how can i avoid this.
Thanks & Regards
Niharika

2017 Aug 28

0

"Improvement with the R code"

Ok, I assumed you wanted to compute a matrix M for all states such that
M[i][j]= transition from state i to state j / number of transition from
state i
but from what you just answered it looks like you want to compute a matrix
M for a set of states S such that:
M[S_i][S_j]= transition from state S_i to state S_j / number of transition
from state S_i where S_i is in the set S
?

2012 May 03

5

Finding local maxima on a loess surface

If a run a LOESS model and then produce a smoothed surface: Is there any
way to determine the coordinates of the local maxima on the surface?
[[alternative HTML version deleted]]

2017 Aug 22

1

Rounding of problem with sum command in R

On 2017-08-22 9:26 AM, niharika singhal wrote:
> Hello I have a vector
> v=c(0.08844446,0.1744455,0.1379778,0.1209769,0.1573065,0.1134463,0.2074027)
> when i do
> sum(v)
> or
> 0.08844446+0.1744455+0.1379778+0.1209769+0.1573065+0.1134463+0.2074027
> i am getting output as 1
No:? That's only the display:
> sum(v)-1
[1] 1.6e-07
????? hope this helps.? Spencer

2017 Sep 20

1

How to use depmix for HMM with intial parameters

Hello,
I have initial parameters for HMM model and I want to use depmixS4 package.
The parameters are in the form
intial_prob_matrix=matrix(c(0.07614213, 0.45177665, 0.47208122), nrow=1,
ncol=3, byrow = TRUE)
transition_matrix=matrix(c(0.46666667,0.46666667,0.06666667,
0.06741573,0.5617978,0.37078652,
0.02173913,0.3478261,0.63043478), nrow = 3, ncol =

2009 Jul 23

2

Non-negative solutions to complicated equations

Hi all,
I have a system of 3 equations with many defined parameters and 3 variables
I need to find solutions to. I actually know the solutions I''m aiming for
(0.07,0.287,0.0061) but R tends to give me (0,0,0).
I tried the "BB" package but don''t really follow how to refine my solutions
from that; these are wrong so far. Here''s my code from trying that:
>

2017 Oct 11

0

"Time Series Plotting"

Hi
keep your emails to R help, I do not offer private consultance and others could have different opinion how to solve your problem.
Did you even try my suggestion? If not, why not? If yes in what respect it does not comply with your expectations.
Cheers
Petr
From: niharika singhal [mailto:niharikasinghal1990 at gmail.com]
Sent: Tuesday, October 10, 2017 2:34 PM
To: PIKAL Petr <petr.pikal at

2017 Aug 22

1

Rounding of problem with sum command in R

... and following up on Spencer's answer, see the "digits" argument of
?options and ?print.default.
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Aug 22, 2017 at 7:30 AM, Spencer Graves
<spencer.graves