Displaying 20 results from an estimated 100 matches similar to: "dfsane arguments"
2011 Apr 28
1
DLSODA error
Dear R-users,
I'm running an MLE procedure where some ODEs are solved for each iteration
in the maximization process. I use mle2 for the Maximum likelihood and
deSolve for the ODEs.
The problem is that somewhere along the way the ODE solver crashes and I get
the following error message:
DLSODA- Warning..Internal T (=R1) and H (=R2)
are
such that in the machine, T + H = T on the next
2011 Dec 07
1
Output table from for loop
Hi, this might be basic but can't get it to work and it is hampering my R
usage:
#the loop is checking variance of rows, and cutting out rows with
var>numVec[i]
#I define outMat as object names I want to output to (does this make sense?
how else
#can I define sequential numbered output?)
#numVec is numbers I use in the loop
head(Counts)
AN1 AN2 AN3 AN4 var
GENE1
2011 Sep 02
1
Using capture.output within a function
Dear R-users
I'm running a maximum likelihood procedure using the spg package. I'd like
to save some output produced in each iteration to a file, but if I put the
capture.output() within the function I get the following message; Error in
spg(par = startval, fn = loglik, gr = NULL, method = 3, lower = lo, :
Failure in initial function evaluation!Error in -fn(par, ...) : invalid
argument
2002 Feb 11
0
profile
I am running 1.3.1 on a Windows (NT 4.0) machine. I've fit a nonlinear
model intended to predict crop yield from nutrient information, and want to
use the profile function. If I type say,
profile(simparj.fm)
I get the following error message:
"Error in prof$getProfile(): number of iterations exceeded maximum of
5.25515e-308"
I used the profiler function to profile simparj,fm step
2011 Apr 23
2
Loop and Solver with Black/Scholes-Formula
Hello,
for my diploma thesis I need to program a solver for Merton?s respectively
Black?s and Scholes? Option pricing formula, which should be achieved for
several dates.
What I want to do is to estimate the value of a firm?s assets "vA" (x[2]
denotes vA) and the option-implied volatility of firm?s assets "sigA" (x[1]
denotes sigA) by solving it simultaneous using the Black
2010 Apr 29
1
BB package
Hi I would like to solve a system of nonlinear equations below using dfsane function
mn <- 142.36; vr <- 9335.69 ; sk <- 0.81; kur <- 0.25
test_fn <- function(p)
{ f <- rep(NA, length(p))
f[1] <- p[1]*(p [2]+p[3])- mn
f[2] <- - vr + 2*p[1]*p[2]*p[3]*(p[4]-1)+p[1]*(p[2]+p[3])^2
f[3] <- - sk + (p[1]*(p [2]+p[3])^3*(p[1]+1)*(p[1]+2)-6*p[1]*p[2]*p[3]*(p[2]+
2010 Mar 11
4
help about solving two equations
I have two matrix s1 and s2, each of them is 1000*1.
and I have two equations:
digamma(p)-digamma(p+q)=s1,
digamma(q)-digamma(p+q)=s2,
and I want to sovle these two equations to get the value of x and y, which are also two 1000*1 matrices.
I write a program like this:
f <- function(x) {
p<- x[1]; q <- x[2];
((digamma(p)-digamma(p+q)-s1[2,]) )^2 +((digamma(q)-digamma(p+q)-s2[2,]) )^2
2010 Nov 21
1
solve nonlinear equation using BBsolve
Hi r-users,
I would like to solve system of nonlinear equation using BBsolve function and
below is my code. I have 4 parameters and I have 4 eqns.
mgf_gammasum <- function(p)
{
t <- rep(NA, length(p))
mn <- 142.36
vr <- 9335.69
sk <- 0.8139635
kur <- 3.252591
rh <- 0.896
# cumulants
k1 <- p[1]*(p[2]+p[3])
k2 <- p[1]*(2*p[2]*p[3]*p[4] +p[2]^2+p[3]^2)
k3 <-
2011 Aug 05
2
Which is more efficient?
Greetings all,
I am curious to know if either of these two sets of code is more efficient?
Example1:
## t-test ##
colA <- temp [ , j ]
colB <- temp [ , k ]
ttr <- t.test ( colA, colB, var.equal=TRUE)
tt_pvalue [ i ] <- ttr$p.value
or
Example2:
tt_pvalue [ i ] <- t.test ( temp[ , j ], temp[ , k ], var.equal=TRUE)
-------------
I have three loops, i, j, k.
One to test the all of
2009 Mar 23
4
newton method
Hi R-users,
Does R has a topic on newton's method?
Thank you for the info.
2009 Jul 17
6
Solving two nonlinear equations with two knowns
Dear R users,
I have two nonlinear equations, f1(x1,x2)=0 and f2(x1,x2)=0. I try to use optim command by minimize f1^2+f2^2 to find x1 and x2. I found the optimal solution changes when I change initial values. How to solve this?
BTW, I also try to use grid searching. But I have no information on ranges of x1 and x2, respectively.
Any suggestion to solve this question?
Thanks,
Kate
2009 Nov 27
1
generating a matrix after a for loop..
Hi all,
I have to ask this and I know that the reason is that I am a newbie with R
programming. So apologize if it is too obvious but I didn't find an answer
after googling and reading "An introduction to R". So i have return
data from 30 instruments and I am fitting a mixture of normal
distributions for the asymmetric marginal distributions and then simulating
from those
2008 Apr 25
5
Non-linear system of equations
Hello R users,
I am trying to estimate the parameters of a bimodal normal distribution using moments matching, so I have to solve a non-linear system of equations. How can I solve the following simple example?
x^2 - y^2 = 6
x ? y = 3
I heard about nlsystemfit, but I don?t know how to run it exactly. I have tried the following code, but it doesn?t really work:
f1 <-y~ x[1]^2-x[2]^2-6
f2
2009 Jul 23
1
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:
> f<-function(x){
2009 Apr 20
1
Two or more dimensional root (Zero) finding
Good morning to all,
I should find the zero of a specific function with
respect to a vector of arguments.
Does it exist something similar in R?
Thank
you very much,
Enrico Foscolo
2009 Mar 16
1
Uniroot and Newton-Raphson Anomaly
I have the following function for which I need to find the root of a:
f <- function(R,a,c,q) sum((1 - (1-R)^a)^(1/a)) - c * q
To give context for the problem, this is a psychometric issue where R is
a vector denoting the percentage of students scoring correct on test
item i in class j, c is the proportion correct on the test by student k,
and q is the number of items on the test in total.
I
2004 Sep 21
3
how to take this experiment with R?
How about:
x <- data.frame(matrix(rnorm(1550),c(50,31)))
model <- step(lm(x[,1] ~ as.matrix(x[,2:31])))
--Matt
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of rongguiwong
Sent: Monday, September 20, 2004 20:52 PM
To: r-help at stat.math.ethz.ch
Subject: [R] how to take this experiment with R?
This message uses
2009 Feb 25
1
leaps question
Colleagues,
please help me with the simple question.
How can I find R2 and p while doing best subsets regression? Also how
can I see B and p for coefficients?
Maybe you can advice me detailed manual, because in manual for the
package this is not described.
Thank you
2007 Aug 08
1
Regsubsets statistics
Dear R-help,
I have used the regsubsets function from the leaps package to do subset
selection of a logistic regression model with 6 independent variables and
all possible ^2 interactions. As I want to get information about the
statistics behind the selection output, I?ve intensively searched the
mailing list to find answers to following questions:
1. What should I do to get the statistics
2009 Mar 17
3
Non-Linear Optimization - Query
Dear All,
I couple of weeks ago, I’ve asked for a package recommendation for nonlinear
optimization. In my problem I have a fairly complicated non-linear objective
function subject to one non-linear equality constrain.
I’ve been suggested to use the *Rdonlp2* package, but I did not get any
results after running the program for 5 hrs. Is it normal to run this type
of programs for hours? Also,