Please use R's search capabilities before posting.
RSiteSearch(Linear Model with Constraints)
appears to give you what you're looking for. Incidentally, with
constraints, the model is no longer linear, I believe.
-- Bert
2011/8/3 ראובן אברמוביץ gantk...@walla.com:
Can I put limits on the
It is hard to prove a negative, but to the best of my knowledge lm will not do
what you want. This does not mean there is not a function that will perform
your analyses; the sort of thing you want to do is often accomplished using
non-linear methods.
John
ראובן אברמוביץgantk...@walla.com
I sometimes have to work with vectors/matrices with 2^31 - 1
elements. I have found the bigmemory package to be of great help. My
lab is also going to learn sqldf package for getting bits of big data
into/out of R. Learning both of those packages should help you work
with large datasets in R.
You probably don't want an object that is larger than about 25% of the
physical memory so that copies can be made during some processing. If
you are running on a 32-bit system which will limit you to at most 3GB
of memory, then your largest object should not be greater than 800MB.
If you want to
On 03/08/2010 1:10 PM, Dimitri Liakhovitski wrote:
I understand the question I am about to ask is rather vague and
depends on the task and my PC memory. However, I'll give it a try:
Let's assume the goal is just to read in the data frame into R and
then do some simple analyses with it (e.g.,
Thanks a lot, it's very helpful!
Dimitri
On Tue, Aug 3, 2010 at 1:53 PM, Duncan Murdoch murdoch.dun...@gmail.com wrote:
On 03/08/2010 1:10 PM, Dimitri Liakhovitski wrote:
I understand the question I am about to ask is rather vague and
depends on the task and my PC memory. However, I'll give
And once one above the limit that Jim indicated - is there anything one can do?
Thank you!
Dimitri
On Tue, Aug 3, 2010 at 2:12 PM, Dimitri Liakhovitski
dimitri.liakhovit...@gmail.com wrote:
Thanks a lot, it's very helpful!
Dimitri
On Tue, Aug 3, 2010 at 1:53 PM, Duncan Murdoch
On 03/08/2010 2:28 PM, Dimitri Liakhovitski wrote:
And once one above the limit that Jim indicated - is there anything one can do?
Yes, there are several packages for handling datasets that are too big
to fit in memory: biglm, ff, etc. You need to change your code to work
with them, so
Uwe Ligges lig...@statistik.tu-dortmund.de wrote:
So you want some software that can do symbolic calculations? In that
case use other software. R is designed for numerical analyses.
In particular, if you are looking for good free software, you
might try Maxima.
--
Mike Prager, NOAA,
Try the rSymPy or Ryacas packages.
In the rSymPy code below the var command defines x
as symbolic to sympy and then we perform the
computation:
library(rSymPy)
Loading required package: rJava
sympy(var('x'))
[1] x
sympy(limit(x*x + x + 2, x, 2))
[1] 8
Or using devel version define x as
Dear Hassam,
Take a look at the section 5.8 in [1].
HTH,
Jorge
[1] http://cran.r-project.org/web/packages/Ryacas/vignettes/Ryacas.pdf
On Tue, May 5, 2009 at 5:39 AM, Hassan Mohamed
hassan_hany_fa...@yahoo.comwrote:
Hey,
what is the R function for the mathematical limit ?
e.g. to calculate
Hassan Mohamed wrote:
Hey,
what is the R function for the mathematical limit ?
e.g. to calculate and return the amount that the expression
X^2 +X +2
approach
as X approach 2
(X- 2)
So you want some software that can do symbolic calculations? In that
case use other software. R is
On 11/26/2007 11:03 AM, Dimitri Liakhovitski wrote:
Hello!
I posted earlier - about my problems with R 2.6 crashing (i.e.,
telling me it needs to shut down) every time I tried to open an R
script. First, it looked like it was unhappy with my working outside
of R folder (under Program Files).
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