Displaying 20 results from an estimated 1000 matches similar to: "call a function with explicitly not setting an argument"
2006 Jul 06
2
use of apply in a data frame on a row by row basis
Hello all,
I'm trying to use the apply function on a data frame,
by applying a function that takes a one row data.frame as argument .
Here's the example :
myfun = function(x) paste(x$f1 , x$f2)
df = data.frame(f1 = c(1,4,10),f2 = "hello")
apply(df,1,myfun) ==> Does not work (I get "character(0)" )
Though : myfun(df[1,]) works,
and myfun(df) works as well.
So if
2017 Jun 18
0
R_using non linear regression with constraints
I've seen a number of problems like this over the years. The fact that the singular values of the Jacobian have
a ration larger than the usual convergence tolerances can mean the codes stop well before the best fit. That is
the "numerical analyst" view. David and Jeff have given geometric and statistical arguments. All views are useful,
but it takes some time to sort them all out and
2017 Jun 18
3
R_using non linear regression with constraints
I am not as expert as John, but I thought it worth pointing out that the
variable substitution technique gives up one set of constraints for
another (b=0 in this case). I also find that plots help me see what is
going on, so here is my reproducible example (note inclusion of library
calls for completeness). Note that NONE of the optimizers mentioned so far
appear to be finding the true best
2017 Jun 18
0
R_using non linear regression with constraints
> On Jun 18, 2017, at 6:24 AM, Manoranjan Muthusamy <ranjanmano167 at gmail.com> wrote:
>
> I am using nlsLM {minpack.lm} to find the values of parameters a and b of
> function myfun which give the best fit for the data set, mydata.
>
> mydata=data.frame(x=c(0,5,9,13,17,20),y = c(0,11,20,29,38,45))
>
> myfun=function(a,b,r,t){
> prd=a*b*(1-exp(-b*r*t))
>
2012 Jul 02
2
Constructing a list using a function...
Hi All
I have a dataframe:
myframe<-data.frame(ID=c("first","second"),x=c(1,2),y=c(3,4))
And I have a function myfun:
myfun<-function(x,y) x+y
I would like to write a function myfun2 that takes myframe and myfun
as parameters and returns a list as below:
mylist
$first
[1] 4
$second
[2] 6
Could you please help me with this? Doesn't seem like the
2017 Jun 18
0
R_using non linear regression with constraints
I ran the following script. I satisfied the constraint by
making a*b a single parameter, which isn't always possible.
I also ran nlxb() from nlsr package, and this gives singular
values of the Jacobian. In the unconstrained case, the svs are
pretty awful, and I wouldn't trust the results as a model, though
the minimum is probably OK. The constrained result has a much
larger sum of squares.
2017 Jun 18
3
R_using non linear regression with constraints
https://cran.r-project.org/web/views/Optimization.html
(Cran's optimization task view -- as always, you should search before posting)
In general, nonlinear optimization with nonlinear constraints is hard,
and the strategy used here (multiplying by a*b < 1000) may not work --
it introduces a discontinuity into the objective function, so
gradient based methods may in particular be
2011 Sep 03
2
problem in applying function in data subset (with a level) - using plyr or other alternative are also welcome
Dear R experts.
I might be missing something obvious. I have been trying to fix this problem
for some weeks. Please help.
#data
ped <- c(rep(1, 4), rep(2, 3), rep(3, 3))
y <- rnorm(10, 8, 2)
# variable set 1
M1a <- sample (c(1, 2,3), 10, replace= T)
M1b <- sample (c(1, 2,3), 10, replace= T)
M1aP1 <- sample (c(1, 2,3), 10, replace= T)
M1bP2 <- sample (c(1, 2,3), 10, replace= T)
2017 Jun 18
2
R_using non linear regression with constraints
I am using nlsLM {minpack.lm} to find the values of parameters a and b of
function myfun which give the best fit for the data set, mydata.
mydata=data.frame(x=c(0,5,9,13,17,20),y = c(0,11,20,29,38,45))
myfun=function(a,b,r,t){
prd=a*b*(1-exp(-b*r*t))
return(prd)}
and using nlsLM
myfit=nlsLM(y~myfun(a,b,r=2,t=x),data=mydata,start=list(a=2000,b=0.05),
lower = c(1000,0),
2011 Jul 25
1
do.call in "with" construction
Dear all,
I'd appreciate any help to rectify what must be a misconception of mine how
environments work:
##########################
myEnv <- new.env()
myEnv$a.env <- 1
myEnv$symbols.env <- "a.env"
a.global <- 2
symbols.global <- "a.global"
myFun <- function(symbols){do.call("print", lapply(symbols, FUN=as.name))}
do.call("myFun",
2004 Mar 11
1
how to pass extra parameters using call() or similar mechanism ?
I am trying to write a function, which would allow to call various methods
and would pass to them extra arbitrary parameters.
My first attempt was to use call() as illustrated below, but apparently
'...' cannot be used in such context.
How can this be achieved ?
Best regards,
Ryszard
> myfun <- function(method, x, ...) {
+ v <- eval(call(method, x, ...))
+ }
> method =
2009 Sep 11
4
[LLVMdev] LLVM-GCC & GV zeroinitializers, 2.5 vs 2.6.
Hello folks,
I have a small piece of C code written like this:
typedef struct {
char a;
int b;
int c;
} foo;
foo myFoo[5] = {{0}};
With llvm-gcc 2.5, I get the following IR:
%struct.foo = type { i8, i32, i32 }
@myFoo = global [5 x %struct.foo] zeroinitializer, align 32
With the current 2.6, I get this:
%0 = type { i8, [11 x i8] }
2012 Feb 08
1
optparse::parse_args, using equals sign or not
Hi
We've found that when using parse_args(..., positional_arguments=FALSE),
it is permissible to invoke our script with either "--myfoo=bar" or
"--myfoo bar"; that is, whether or not the equals sign is present makes
no difference, and in fact both usage forms are demonstrated in the
optparse vignette.
However, we've found that when using parse_args(...,
2011 Oct 16
2
right justify right-axis tick values in lattice
How can I right justify the right-axis tick values? They appear in the
example below as left-justified.
I have tried several different ways and all fail in different ways.
The example below creates the right axis tick value with no attempt at
adjustment.
alternates I have tried are
1. formatting the values. This doesn't work because they are in a
proportional font and the blanks
are too
2011 May 26
1
Is it possible to define a function's arguments via a wildcard in 'substitute()'?
Dear List,
just out of pure curiosity: is it possible to define a function via
'substitute()' such that the function's formal arguments are specified
by a "wildcard" that is substituted when the expression is evaluated?
Simple example:
x.args <- formals("data.frame")
x.body <- expression(
out <- myArg + 100,
return(out)
)
expr <-
2009 Sep 11
0
[LLVMdev] LLVM-GCC & GV zeroinitializers, 2.5 vs 2.6.
Hello Julien,
I think the reason for the change was because there is processor context information stored in the type in 2.6. The reason it's there is to support multicore JIT architecture.
--Sam
----- Original Message ----
> From: Julien Lerouge <jlerouge at apple.com>
> To: LLVM Developers Mailing List <llvmdev at cs.uiuc.edu>
> Sent: Thursday, September 10, 2009
2002 May 18
5
Length of a string
Hi,
Suppose I have created something like this in R:
foo <- "myfoo"
and I want to find out the number of character in foo (in other words, R
should return 5 since "myfoo" has 5 charactors.
How can I do it? I tried:
length(foo)
but it returned 1.
Cheers,
Kevin
------------------------------------------------------------------------------
Ko-Kang Kevin Wang
2005 Aug 25
1
"couldn't find function" error message in R 2.1.1
Dear R-help,
I have a home-made package works perfectly under R 1.9.1. Now I'm trying to
port it to R > 2.0. So I rebuild the package under R 2.1.1. It installs and
loads OK. But when I try to call some functions "myfoo" in this package, it
returns error message: "Couldn't find function myfoo". I checked all
available manuals, and didn't find any specific
2011 Feb 26
0
[LLVMdev] LLVM IR Type System Rewrite
On Sat, Feb 26, 2011 at 10:25 PM, Chris Lattner <clattner at apple.com> wrote:
> Several people have been proding me to write up my thoughts on how to fix the IR type system for LLVM 3.0. Here are some (fairly stream of conscious) thoughts on the matter:
> http://nondot.org/sabre/LLVMNotes/TypeSystemRewrite.txt
>
> Comments welcome!
So struct types would unique by name. How
2011 Jul 05
1
Create factor variable by groups
Hi, suppose that I have the following data.frame:
cnae4 cnpj 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Y
24996 10020470 1 1 2 12 16 21 17 51 43 19 183
24996 10020470 69 91 79 92 91 77 90 96 98 108 891
36145 10020470 0 0 0 0 2 83 112 97 91 144 529
44444 10023333 5 20 60 0 0 0 0 5 20 1000 1110
I would like to create a new variable X that indicates which