Displaying 11 results from an estimated 11 matches for "swidan".
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shidan
2008 Mar 07
5
Puzzling coefficients for linear fitting to polynom
...fficients:
> coefficients(f)
(Intercept) poly(x, 2)1 poly(x, 2)2
4.6666667 5.6568542 0.8164966
However the fitted() result makes sense:
> fitted(f)
1 2 3
1 4 9
This is very confusing. How should one understand the result of
coefficients()?
Thanks for any tips,
Firas.
--
Firas Swidan, PhD
Founder and CEO
Olymons: Blessing Machines with Vision (TM)
http://www.olymons.com
P.O.Box 8125
Nazareth 16480
Israel
Cell: +.972.(0)54.733.1788
2007 Nov 10
5
client hangs on pxelinux
...s after printing the ip information row. No traffic is
observed at this point on the network. The pxelinux is transferred to
the client through a tftp server and with no problems.
What options do I have to proceed from this point and try to find out
where the problem is?
Thanks,
Firas.
--
Firas Swidan, PhD
Founder and CEO
Olymons: Blessing Machines with Vision (TM)
http://www.olymons.com
2008 Jul 23
3
Quantitative analysis of non-standard scatter plots.
Hi,
I am having difficulties in finding ways to analyse scatter plots and
quantitatively differentiate between them. Since this is best demonstrated
by a figure, I have attached one with 4 subfigures (a)-(d). Qualitatively
(and I hope you would agree with me), sub-figures (a), (b), and (d) seem to
represent uniform 2d scatters. It is hard for me to quantify it, but it
seems as if the envelopes
2007 Nov 14
2
PXE in wonderland
...ecuting.
Now I am not sure how to proceed. I am also wondering if the instruction
"int 16h" has such a far reaching effects. Could it be the reason for
the failing checksum and the not responding keyboard (after all it
managed to stuck my whole pc)?
To be concluded.
Firas.
--
Firas Swidan, PhD
Founder and CEO
Olymons: Blessing Machines with Vision (TM)
http://www.olymons.com
P.O.Box 8125
Nazareth 16480
Israel
Cell: +.972.(0)54.733.1788
2005 Apr 19
2
Printing a single "\" character
Hi,
I have a small R question: how to print a single "\" character? I have the
following results:
> print("\") does not work
> print("\\")
[1] "\\"
I need to make the following substitution as well, but it does not work
either:
> sub("_","\_","g_g")
[1] "g_g"
Thanks in advance,
Firas.
2005 Feb 25
3
Loops and dataframes
Hi,
I am experiencing a long delay when using dataframes inside loops and was
wordering if this is a bug or not.
Example code:
> st <- rep(1,100000)
> ed <- rep(2,100000)
> for(i in 1:length(st)) st[i] <- ed[i] # works fine
> df <- data.frame(start=st,end=ed)
> for(i in 1:dim(df)[1]) df[i,1] <- df[i,2] #takes for ever
R: R 2.0.0 (2004-10-04)
OS: Linux, Fedora Core 2
2006 Aug 01
2
Indexing issue
Hi,
R is having the following weird behavior and I am not sure if that is a
feature or a bug:
I am working on the following "3D" array:
> bIm
, , 1
[,1]
[1,] TRUE
[2,] TRUE
[3,] TRUE
[4,] TRUE
[5,] TRUE
> class(bIm)
[1] "array"
> dim(bIm)
[1] 5 1 1
When I try to get the first 2D subarray, the whole thing folds into a
vector:
> bIm[,,1]
[1] TRUE TRUE TRUE
2005 Apr 14
2
Printing integers in R "as is"
Hi,
I am using the following command to print to a file (I omitted the file
details):
cat( paste( paste(orientation, start, end, names,"\n"), paste(start, end,
"exon\n"), sep=""))
where "orientation" and "names" are character vectors and "start" and
"end" are integer vectors.
The problem is that R coerce the integer vectors
2006 Aug 09
2
Speeding indexing and sub-sectioning of 3d array
Hi,
I am having a problem with a very slow indexing and sub-sectioning of a 3d
array:
> dim(arr)
[1] 245 175 150
For each point in the array, I am trying to calculate the mean of the values
in its surrounding:
mean( arr[ (i - radius):(i + radius),
(j - radius):(j + radius),
(k - radius):(k + radius)] )
Putting that code in 3
2006 Apr 27
1
R interface to ImageMagick
Hi,
I was wondering if anyone is aware of an R interface to ImageMagick
(www.imagemagick.org)? Since R does not support a lot of image processing
functions, having such an interface could be very useful. Alternatively,
ImageMagick has a couple of different interfaces (including to C and C++). I
was wondering if one can use these to call ImageMagick functions from R.
I am posting a similar
2008 Aug 13
1
The standard deviation of measurement 1 with respect to measurement 2
Hi,
I have two (different types of) measurements, say X and Y, resulting from
the same set of experiments. So X and Y are paired: (x_1, y_1), (x_2, y_2),
...
I am trying to calculate the standard deviation of Y with respect to X. In
other words, in terms of the scatter plot of X and Y, I would like to divide
it into bins along the X-axis and for each bin calculate the standard
deviation along