[R] fractal calculation using fdim

[Robert W. Baer, Ph.D.]

Well I must say that I am still struggling to understand exactly how fdim
works, and what form the first argument is to take.  Presumably the function
produces something like 1-slope for a log log plot as a fractal dimension.
I guess it is really the makeline() function I don't understand from the
documentation.  Is that how you got your data or are you using real data?

That said, I note in the help that the first argument X is to be a dataframe
not a matrix  (mat??).  Could that be giving you problems?  Do you get
better results with as.data.frame(mat)?

Rob
----- Original Message ----- 
From: "Fred J." <phddas at yahoo.com>
To: "r help" <r-help at stat.math.ethz.ch>
Sent: Monday, April 12, 2004 6:05 PM
Subject: [R] 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   10
> [1] 2734   11
> [1] 2733   12
> Error in slopeopt(AllPoints, Alpha) : Object "LineP"
> not found
> if I change the data set to mat2 with totally
> different values I would get the above error at a
> dim(mat) of say
> 2693  52
>
> thanks for any input.
>
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