Displaying 20 results from an estimated 1000 matches similar to: "buglet in curve?"
2009 May 24
1
filling area under a function line
Hi R collective,
I quite like the "curve" function because you can chuck a R function
into it, and see the graph in one line of R.
I had a google and found some threads for filling under the line;
http://tolstoy.newcastle.edu.au/R/e2/help/07/09/25457.html
However they seem to miss the point of the simplicity of going, "I
wonder what that looks like, and can I have some colour
2007 May 12
1
Area() artefacts??
Hello, everybody
I run the following program, and depending on the size of eps I get
different results.
With eps=1e-05, the program calculates wrong values for x=65:67 and
others. The program runs fine with eps=1e-07. Why is this so?
Also, I am using area() instead of integrate() because I cannot make
integrate to work, especially with imaginary numbers. Maybe someone
can show me how to use
2011 May 02
2
easy way to do a 2-D fit to an array of data?
Hi,
I've got a matrix, Z, of values representing (as it happens) optical
power at each pixel location. Since I know in advance I've got a
single, convex peak, I would like to do a 2D parabolic fit of the form
Z = poly((x+y),2) where x and y are the x,y coordinates of each pixel
(or equivalently, the row, column numbers).
Is there an R function that lets me easily implement that?
2006 Oct 27
2
Multivariate regression
Hi,
Suppose I have a multivariate response Y (n x k) obtained at a set of
predictors X (n x p). I would like to perform a linear regression taking
into consideration the covariance structure of Y within each unit - this
would be represented by a specified matrix V (k x k), assumed to be the same
across units. How do I use "lm" to do this?
One approach that I was thinking of
2012 Feb 09
2
Lattice 3d coordinate transformation
Hello List!
I asked this before (with no solution), but maybe this time... I'm
trying to project a surface to the XY under a 3d cloud using lattice.
I can project contour lines following the code for fig 13.7 in
Deepayan Sarkar's "Lattice, Multivariate Data Visualization with R",
but it fails when I try to "color them in" using panel.levelplot.
?utilities.3d says there
2007 Sep 04
3
how to do interpolation
Hello R Users,
How to make a variable equidistance with time i.e. how to interpolate a
variable if it is not sampled at equal time interval.
Many thanks,
Regards,
Yogesh
[[alternative HTML version deleted]]
2005 Mar 11
3
delay() has been deprecated for 2.1.0
After a bunch of discussion in the core group, we have decided to
deprecate the delay() function (which was introduced as "experimental"
in R 0.50). This is the function that duplicates in R code the
delayed evaluation mechanism (the promise) that's used in evaluating
function arguments.
The problem with delay() was that it was handled inconsistently (e.g.
sometimes you would see
2009 Mar 25
1
Piecewise
Hi,
I am a biologist (relatively new to R) analyzing data which we predict
to fit a power function. I was wondering if anyone knew a way to model
piecewise functions in R, where across a range of values (0-x) the data
is modeled as a power function, and across another range (x-inf) it is a
linear function. This would be predicted by one of our hypotheses, and
we would like to find the AICs
2009 Jul 21
2
animated grid graphics
I need to make a fairly complex animated graphic and decided to use grid for it.
A very simple example of what I need:
##==============================================================================
library(grid)
grid.newpage()
pushViewport(plotViewport())
pushViewport(viewport(xscale = extendrange(c(0, 100)),
yscale = extendrange(c(0, 100))))
grid.xaxis()
grid.yaxis()
2014 Feb 03
1
seq range argument
Hello dear developers,
I find myself often having the result of "range" oder "extendrange", which I want to create a sequence with.
But "seq" needs two seperate arguments "from" and "two".
Could an argument "range" be added?
Otherwise I will have to create an object with the range (may come from a longer calculation), index twice from
2000 Jan 19
1
Segmentation fault using integrate()
Hi all,
Running R 0.90.1 on a RH 6.1 system. Installation of the
integrate_2.1-2 package went smoothly. My code contains a loop
in which integrate() is called several times in each pass.
I get a segmentation fault after what seems to be a random number
of calls to integrate(). Debug output shows:
Program received signal SIGSEGV, Segmentation fault.
promiseArgs (el=0x40276414,
2007 Jul 24
1
How to add circular text for a graph with concentric circles
Dear R experts,
I am plotting the population of students who live in a city, and in
successive circular bands made of the contiguous districts that surround
the city. This is a stylized figure, where I specify the area of each
successive circle based on the cumulative population of students. I want
to compare two sets of concentric circles across different populations -
such as 'All
2012 Apr 29
1
A doubt about substitute() after delayedAssign()
Hello,
?delayedAssign presents substitute() as a way to look at the expression
in the promise. However,
msg <- "old"
delayedAssign("x", msg)
msg <- "new!"
x #- new!
substitute(x) #- x (was 'msg' ?)
Here, we just got 'x'... shouldn't we got 'msg'?
Same result when the promise is not evaluated yet:
delayedAssign("x",
2012 Apr 25
4
delayedAssign changing values
I'm not sure if this is a known peculiarity or a bug, but I stumbled across what I think is very odd behavior from delayedAssign. In the below example x switches values the first two times it is evaluated.
> delayedAssign("x", {x <- 2; x+3})
> x==x
[1] FALSE
> delayedAssign("x", {x <- 2; x+3})
> x
[1] 5
> x
[1] 2
The ?delayedAssign documentation says
2013 May 16
3
Substitute / delayedAssign (was: Substitute unaware when promise objects are evaluated)
Duncan, Thank you for the clarification on how delayedAssign works. Should R-level interfaces to promise objects ever become available, I expect they would at time come in handy.
On the subject of substitute and delayedAssign, I do have a follow-up question for the list. I'm trying to convert a named list of expression objects into an environment of promise objects. After conversion, each
2007 Feb 13
1
question on docs for delayedAssign and substitute
The help files for delayedAssign and substitute both say that
substitute() can be used to see the expression associated with a
promise. However, I can't see how to do that. When I try the example
in help file for delayedAssign I don't see substitute() extracting the
promise, e.g.:
> msg <- "old"
> delayedAssign("x", msg)
> msg <-
2007 Sep 20
1
copying promise
1. Is there some way to copy a promise so that the copy has the same
expression in its promise as the original. In the following we
y is a promise that we want to copy to z. We
want z to be a promise based on the expression x since y is a
promise based on the expression x. Thus the answer to the code
below is desired to be z=2 but its 1, 1 and y in the next three
examples so they are not the
2015 Jan 27
0
Inspect a "delayed" assigned whose value throws an error?
>>>>> Henrik Bengtsson <hb at biostat.ucsf.edu>
>>>>> on Mon, 26 Jan 2015 12:41:48 -0800 writes:
> On Mon, Jan 26, 2015 at 12:24 PM, Hadley Wickham <h.wickham at gmail.com> wrote:
>> If it was any other environment than the global, you could use substitute:
>>
>> e <- new.env()
>>
2011 May 02
2
Using substitute to access the expression related to a promise
Hi all,
The help for delayedAssign suggests that you can use substitute to
access the expression associated with a promise, and the help for
substitute says: "If it is a promise object, i.e., a formal argument
to a function or explicitly created using ?delayedAssign()?, the
expression slot of the promise replaces the symbol.
But this doesn't seem to work:
> a <- 1
> b <- 2
2008 Nov 20
1
binomial glm???
Hi everyone,
newbee query!
I've installed R 2.8.0 and tried to run this simple glm -
x is no of cars in a given year, y is the number voted in an election
that year while n is the population 18+:
votes <- data.frame(x = c(0.62,0.77,0.71,0.74,0.77,0.86,1.13,1.44),
+ y=c(502,542,711,653,771,806,934,1123), n=