Displaying 20 results from an estimated 600 matches similar to: "fdim questions"
2009 Apr 24
1
Box-counting dimension and package 'fdim'
Dear R-helpers,
I am looking for an implementation of the box-counting algorithm to
estimate the box dimension of a cloud of points in 3D (aka fractal
dimension, or similarity dimension).
The package 'fdim' might be doing this, but the documentation is awful
and I don't understand what is what there.
Does anyone know of an implementation of this algorithm in R, or
elsewhere, or
2001 Jan 25
0
fdim problems
hi
I am trying to use the add-on package fdim to calculate fractal
dimesionality of some time series data.
I keep getting an error - trying to run simple example from the help
pages
Error in if (MaxDiff > Chi2) { : missing value where logical needed
when I set the debug option of the function slopeopt()
I get the following read out...
[1] "###############################"
[1]
2017 Aug 10
2
Problem with the fdim package
Hi,
I?m new to R but I?m interested in using the fdim package to find the fractal dimension of a dataset. I downloaded the the package from https://cran.r-project.org/src/contrib/Archive/fdim/ and successfully installed it together with xgobi.
However, when I try to run the first example, after df <- fdim(mydata,q=0,Alpha=0.3) I get the following error:
Error in .C("pointdif",
2017 Aug 11
0
Problem with the fdim package
Hm, I am not an expert in this field but trying to use obviously old package which was removed about 5 years ago from CRAN is asking for problems. There is probably some incompatibility between recent R version and obsolete package.
You either
1. need to install/compile R version from 2012 and install/compile this old package for this version.
2. Or you could try to find some similar
2004 Apr 12
2
fractal calculation using fdim
Hello
I am getting this
Error in slopeopt(AllPoints, Alpha) : Object "LineP"
not found
when the dim(<data.frame>) of the data matrix for
which the fdim is being calculated hits a certain
values depending on the data set. e.g
print(dim(mat))
fd <- fdim(mat,q=2)
[1] 2743 2
[1] 2742 3
[1] 2741 4
[1] 2740 5
[1] 2739 6
[1] 2738 7
[1] 2737 8
[1] 2736 9
[1] 2735
2004 Apr 25
2
package fdim slopeopt error (PR#6819)
Full_Name: Fred J.
Version: 1.8.1
OS: windows 2000
Submission from: (NULL) (203.26.24.216)
platform i386-pc-mingw32
the error can be duplicated as follows
> rt <- data.frame(8:15, 7:14, 6:13, 5:12, 4:11, 3:10, 2:9, 1:8)
> library(fdim)
> FD <- (fdim(rt,q=2))
Error in slopeopt(AllPoints, Alpha) : Object "LineP" not found
2004 Mar 05
0
fractal function
Hello
Does any one know what is the complexity scale of fdim
"fractal calculation function", I need to find O(N)
function to do fractal calculation.
Thanks a lot
2004 Sep 15
1
fractal dimension of an image
Hello, I have a problem that I think can be solved in R but I'm not sure
how to tie things together.
I have a digital image of a crystal growth in 2 dimensions. And my aim
is to calculate the fractal dimension of the crystal. I was planning to
use the box counting method.
So I need to read in the image in R (for which I can use the pixmap or
rimage packages) and then draw a grid over at a
2005 Feb 11
3
Saving graphs in formats other than PDF?
I am running R 2.01 on Mac OS 10.3.7. Whenever I save graphs, they are
saved as PDF files. Are there any other file formats to which I could save
my graphs. I would like to directly export my graphs to MS Word, if
possible.
Thank you in advance.
Sincerely,
Jim Milks
Graduate Student
Environmental Sciences Ph.D. Program
Wright State University
3640 Colonel Glenn Hwy
Dayton, OH 45435
2007 Jun 12
4
Generating artificial datasets with a specific correlation coefficient.
I need to create artificial datasets with specific correlation
coefficients (i.e. a dataset that returns r = 0.30, etc.) as examples
for a lab I am teaching this summer. Is there a way to do that in R?
Thanks.
Jim Milks
Graduate Student
Environmental Sciences Ph.D. Program
136 Biological Sciences
Wright State University
3640 Colonel Glenn Hwy
Dayton, OH 45435
[[alternative HTML version
2005 May 31
2
plane3d
I am attempting to fit a logistic regression plane to a 3-D scatterplot
(which was generated using scatterplot3d). I've noticed that the help
pages of scatterplot3d include a function titled "plane3d." However,
when I attempt to use the function, I get the following message:
Error: couldn't find function "plane3d"
I've searched the archives and found no
2005 Apr 18
1
Forcing best-fit lines to go through the origin
Dear All,
I have a rather unusual problem. I have a set of data for a class in
subsurface processes. From that dataset, I must calculate the slope of
the best-fit line (which is the parameter of interest). The problem I
have is twofold: 1) for the purposes of the exercise, I must force my
best-fit line to go through the origin (0,0), and 2) the line must be
linear, even though the data is
2007 Jul 02
4
Extracting sums for individual factors in data frames
I have a data frame with two columns, one of which is a factor
(Species) and the other is numeric (BA, which stands for basal
area). Here's a sample:
Species BA
ACSA 55.7632696
FRAM 122.9933524
ACSA 67.54424205
ACSA 89.22123136
ACSA 82.46680716
ACSA 22.46238747
ACSA 19.94911335
ACSA 20.42035225
ACSA 19.00663555
ACSA 21.67698931
ACSA 57.80530483
ACSA 30.31636911
Dead 43.98229715
Dead
2007 Aug 31
1
Strange behavior using subset
Dear R Gurus,
Let's get the technical details out of the way first:
Computer: 1.83 GHz MacBook
R version 2.5.1
I have a data set that contains the following variables: site,
species, total.vines. I need to partition the main data set by site,
the further select only those species that occurred at each site.
When I select by site (site.name<-subset(data frame,Site=="Site
2005 May 01
1
Partial F-test comparing full and reduced regression models
Dear all:
I have a regression model that has collinearity problems (between three
regressor variables). I need a F-test that will allow me to compare
between full (with all variables) and partial models (minus 1=<
variables). The general F-test formula I'm using is:
F = {[SS(full model) - SS(reduced model)] / (#variables taken out)} /
MSS(full model)
Unfortunately, the ANOVA table
2007 Aug 13
2
Error message when using zero-inflated count regression model in package zicounts
I have data on number of vines per tree for ~550 trees. Over half of
the trees did not have any vines and the data is fairly skewed
(median = 0, mean = 1.158, 3rd qu. = 1.000). I am attempting to
investigate whether plot location (four sites), species (I'm using
only the four most common species), or tree dbh has a significant
influence on the number of vines per tree. When I
2006 Mar 24
0
Adding gs line to Renviron file on Mac
First the technical details: I'm running Mac OS 10.4.5, R 2.2.0, and
just downloaded Ghostscript 8.50 to my Applications folder.
My problem is this: after adding
## Ghostscript
R_GSCMD=${RGSCMD='/usr/bin/gs'}
to my Renviron file, as suggested in several posts on this problem
contained in the archives, I still get
Error in bitmap("acaldi.bmp", res = 100) :
sorry,
2001 Dec 21
0
read.table and as.vector (Was error message: "Error in model.frame")
Hi all,
I figured out some things about an earlier question I posted today; this
is a new question:
I have a for-loop in which I have the following lines
for (i in list.files(pattern = "*.dmp")) {
currentfile <- read.table(i)
vecrawrts <- as.vector(currentfile$V3)
...
}
Now, vecrawrts is numeric, but if I run the script on all the files with
extension .dmp, I get the
2007 Jan 31
3
possible bug: dev.copy / could not find any X11 fonts
Hi,
I am experiencing something strange, and thought I would ask before
reporting a bug. I trimmed it down to a self-contained example,
attached as an R file. The purpose of the functions is to save the
plots into a ps file and simultaneously plot them on an x11 device,
but don't open a new one if there is already one opened (I don't want
the repositioning / flicker).
When running the
2007 Jul 31
2
choosing between Poisson regression models: no interactions vs. interactions
R gurus,
I'm working on data analysis for a small project. My response
variable is total vines per tree (median = 0, mean = 1.65, min = 0,
max = 24). My predictors are two categorical variables (four sites
and four species) and one continuous (tree diameter at breast height
(DBH)). The main question I'm attempting to answer is whether or not
the species identity of a tree has