Displaying 20 results from an estimated 2000 matches similar to: "Row wise solving an equation"
2020 Oct 06
0
Solving a simple linear equation using uniroot give error object 'x' not found
On 06/10/2020 11:00 a.m., Sorkin, John wrote:
> Colleagues,
> I am trying to learn to use uniroot to solve a simple linear equation. I define the function, prove the function and a call to the function works. When I try to use uniroot to solve the equation I get an error message,
> Error in yfu n(x,10,20) : object 'x' not found.
>
> I hope someone can tell we how I can fix
2020 Oct 06
4
Solving a simple linear equation using uniroot give error object 'x' not found
Colleagues,
I am trying to learn to use uniroot to solve a simple linear equation. I define the function, prove the function and a call to the function works. When I try to use uniroot to solve the equation I get an error message,
Error in yfu n(x,10,20) : object 'x' not found.
I hope someone can tell we how I can fix the problem
2012 Mar 24
1
Solving the equation using uniroot
Hello all,
I was going to solve (n-m)! * (n-k)! = 0.5 *n! * (n-m-k)!
for m when values of n and k are provided
n1<-c(10,13,18,30,60,100,500) # values of n
kx<-seq(1,7,1); # values of k
slv2<-lapply(n1,function(n){
slv1<-lapply(kx,function(k){
lhs<-function(m)
{
2009 Jun 09
1
Problem : solving a equation with R , fail with uniroot function
Hi ,
I would like to know if a R function have the same behaviour than the matlab
solve function.
I tried something with uniroot but I have some problems:
The equation I need to solve is :
exp(c0-r0)*(bb0+x)*(bb1-x)=(bb0+x+1)(bb1-x-1)
So I tried this:
STEP 1: my function test
test <- function(x,bb0=-3,bb1=5,c0=2,r0=0) {
+ ((exp(c0-r0)*(bb0+x)*(bb1-x))/((bb0+x+1)(bb1-x-1))-1)}
STEP 2:
>
2009 Dec 15
7
ZFS Dedupe reporting incorrect savings
Hi,
Created a zpool with 64k recordsize and enabled dedupe on it.
zpool create -O recordsize=64k TestPool device1
zfs set dedup=on TestPool
I copied files onto this pool over nfs from a windows client.
Here is the output of zpool list
Prompt:~# zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
TestPool 696G 19.1G 677G 2% 1.13x ONLINE -
When I ran a
2010 May 01
1
Solving equation
Hello,
I want to solve: x*(3^x)*log(4)-x*log(4/3)-(3^x)+1=0 for x. I used the following code,
uniroot(function(x) x*(3^x)*log(4)-x*log(4/3)-(3^x)+1, lower = -2, upper = 2, tol = 0.001 )
While using this I am getting the following error. Can anyone please help me out.
Error in uniroot(function(x) x * (3^x) * log(4) - x * log(4/3) - (3^x) + : f() values at end points not of opposite sign.
2012 Feb 04
2
zpool fails with panic in zio_ddt_free()
Hello all,
I am not sure my original mail got through to the list
(I haven''t received it back), so I attach it below.
Anyhow, now I have a saved kernel crash dump of the system
panicking when it tries to - I believe - deferred-release
the corrupted deduped blocks which are no longer referenced
by the userdata/blockpointer tree.
As I previously wrote in my thread on unfixeable
2014 Jan 06
2
Reversing the Equation to find value of variable
Dear R forum
I have following variables -
EAD = 10000
LGD = 0.45
PD = 0.47
M = 3
# Equation 1
R = 0.12*(1-exp(-50*PD))/(1-exp(-50)) + 0.24*(1-(1-exp(-50*PD))/(1-exp(-50)))
b = (0.11852 - 0.05478 * log(PD))^2
K = (LGD * pnorm((1 - R)^(-0.5) * qnorm(PD) + (R / (1 - R))^0.5 * qnorm(0.999)) - PD * LGD) * (1 - 1.5 * b)^(-1) * (1 + (M - 2.5) * b)
RWA = K * 12.5 * EAD
> RWA
[1] 22845.07
#
2009 Oct 15
3
Solving an equation in R (and using a loop)
Hi
So, I have a dataset and I'm trying to solve for a parameter in an equation
using the dataset. Before applying more sophisticated statistical
techniques, I want to tell R to solve it out for each observation. I know I
have to use a loop for it (and I have done that before, but am a bit rusty),
but before I do that, I'm trying to get R to solve it for just one
observation, to make sure
2018 Jun 13
2
RFC: cleanup in Transforms/Utils
Hi,
I'm looking to see what's the best way to solve the fact that these two
utils mostly do the same thing:
1. lib/Transforms/Utils/Local.cpp : MergeBasicBlockIntoOnlyPred
2. lib/Transforms/Utils/BasicBlockUtils.cpp : MergeBlockIntoPredecessor
(+cc some of the folks who touched at least one of these either originally
or recently)
Brief overview:
1. MergeBasicBlockIntoOnlyPred 2.
2011 May 17
0
Help fit 5 nonlinear models. - Plant growth curves
Hi!! Can anyone help me, i have problems to converge the following
data with 5 nonlinears models that i evaluated.
Firtly, i send my data (totalsinatipicos) that i just try to fit with
the nonlinear models.
Next, i have the following script where i called the data as
totalsinatipicos. I made selfstarting each nonlinear model.
###Library
library(NRAIA)
###Data
d<-totalsinatipicos
2001 Sep 19
6
Winbind authentication
Hi everyone,
First of all, could you please CC me, I am not (yet) subscribed to this
list.
Now my problem:
I created a test setup at my office that uses winbind to authenticate linux
users to a Windows NT server (they log in with DOMAIN+username), as described
in the winbindd manpage. I followed their setup completely.
(at my work I am using RedHat 7.1 and the winbindd daemon found in the
2012 Oct 14
1
Finding root of quadratic equation
Dear R Helpers, I need to find the root of following equationy=x^2+3*x-1 by
substitution a random number from less to more in the certain segment.I had
tried using this codef <- function (x) x^2+x-12str(xmin <- uniroot(f, c(2,
4), tol = 0.0001)) but $ f.root : num -7.85e-07not 0, and so I'm not
shure it's right code and satisfactory answer. Please guide. sveta
--
View this
2003 May 13
2
cli_pipe: return critical error. Error was Call returnedzerobyte(EOF),hilfe!
|.................
| This would *possibly* map to the files of your
| driver like this:
|
| Long Printer Name:\ --> lp:\
|...........................
| missing: should be "RAW" !! #####
|
| Yeah, you're right. I've missed the RAW DDT. Now
| when I complied I got the error from the subject
| line.
|
| Sorry? I didn't
2012 Jul 26
3
Solving quadratic equation in R
Hi there,
I would like to solve a simple equation in R
a^2 - a = 8.313
There is no real solution to this problem but I would like to get an
approximate numerical solution. Can someone suggest how I can set this up?
Thanks in advance,
Diviya
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2007 Apr 25
4
How to solve difficult equations?
This below is not solvable with uniroot to find "a":
fn=function(a){
b=(0.7/a)-a
(1/(a+b+1))-0.0025
}
uniroot(fn,c(-500,500)) gives
"Error in uniroot(fn, c(-500, 500)) : f() values at end points not of
opposite sign"
I read R-help posts and someone wrote a function:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/92407.html
but it is not very precise. Is there any
2008 May 24
1
Solving 100th order equation
Hi R,
I have a 100th order equation for which I need to solve the value for x. Is there a package to do this?
For example my equation is:
(x^100 )- (2*x^99) +(10*x^50)+.............. +(6*x ) = 4000
I have only one unknown value and that is x. How do I solve for this?
BR, Shubha
Shubha Karanth | Amba Research
Ph +91 80 3980 8031 | Mob +91 94 4886 4510
Bangalore *
2009 Nov 04
2
solving a linear equation
Hi all,
I've a linear equation of the form:
0.95=2 ( [3+ln(x/3)]^-13 + 4 [3+2ln(x/3)]^-13 + [3+4ln(x/3)]^-13 )
and I want to solve it for x, can I do this using R?
Thanks in advance.
Maram.
[[alternative HTML version deleted]]
2011 Feb 21
1
question about solving equation using bisection method
Hi all,
I have the following two function f1 and f2.
f1 <- function(lambda,z,p1){
lambda*(p1*exp(-3*z-9/2)+(0.2-p1)*exp(4*z-8))-(1-lambda)*0.8}
f2 <- function(p1,cl, cu){
0.8*(pnorm(cl)+(1-pnorm(cu)))/(0.8*(pnorm(cl)+(1-pnorm(cu)))+p1*(pnorm(cl+3)+(1-pnorm(cu+3)))+(0.2-p1)*(pnorm(cl-4)+(1-pnorm(cu-4))))}-0.05
First fix p1 to be 0.15.
(i) choose a lambda value, say lamda=0.6,
(ii)
2010 Feb 01
0
quick overhead sizing for DDT and L2ARC
Two related questions:
- given an existing pool with dedup''d data, how can I find the
current size of the DDT? I presume some zdb work to find and dump the
relevant object, but what specifically?
- what''s the expansion ratio for the memory overhead of L2ARC entries?
If I know my DDT can fit on a ssd of size X, that''s good - but how
much RAM do I need