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Ravi Varadhan <rvaradhan <at> jhmi.edu> writes: > dist <- function(A, B) { > # Frobenius norm of A - B > n <- nrow(A) > sum(abs(B - A)) > } > See http://mathworld.wolfram.com/FrobeniusNorm.html for a definition of the Frobenius norm. Erwin ---------------------------------------------------------------- Erwin Kalvelagen...

Dimitri Shvorob <dimitri.shvorob <at> gmail.com> writes: > > > ?!! Erwin, may I ask for a working code sample? (Including appropriate > package(s)) > > Thank you. I used GAMS + CPlex. The models are here: http://yetanothermathprogrammingconsultant.blogspot.com/2010/01/solving- optimization-problem...

Hi: This is more a statistical question than an R question (apologies!). I have some income data as follows: <$5000 : 598 $5000-$10000 : 2586 .... $65001-$70000 : 202 $70001+ : 446 I.e an open ended income class for incomes > $70k. What...

Ravi Varadhan <rvaradhan <at> jhmi.edu> writes: > > > When I increased N = 1000, the time was about 1400 seconds! > Not sure of this is important for you: This can be solved much faster. A good solver can solve the n=1000...

Dimitri Shvorob <dimitri.shvorob <at> gmail.com> writes: > > > A 40-element subset proves too much :( > > > Error: cannot allocate vector of size 554.1 Mb > > Thanks, Bart! I could solve a problem with n=200, k=40 with Cplex's MIQP...

Hans W Borchers <hwborchers <at> googlemail.com> writes: > # Prepare inputs for MILP solver > obj <- c(rep(0, n), 0, 1, 1, 0) > typ <- c(rep("B", n), "B", "C", "C", "B") > mat <- matrix(c( s, -z, -1, 1, 0, # a...

Jerome Chong <jeromechong <at> gmail.com> writes: > > Hello, > > 1) Is there any nonlinear programming optmizer that I can user for the > following problem? > > Obj function: (max) revenue = price * volume > Constraints: price and volume pair must be from the following variable...

Jerome Chong <jeromechong <at> gmail.com> writes: > > Greetings, > > What I want to do is to perform regression the data set to get a > revenue function, and use that revenue function to find the maximum > point (maybe with some constraints applied...

<klausch <at> gmx.de> writes: > > Dear R-experts, > > this is not a direct R-problem but I hope you can help me anyway. > > I would like to minimize || PG-I || over P, where P is a p x p permutation...

Hans W Borchers <hwborchers <at> googlemail.com> writes: > > For an application in image processing -- using R for statistical purposes -- I > need to solve the following task: > > Given n (e.g. n = 100 or 200) points in the unit square, more...

ruchita gupta <ruchitarg123 <at> gmail.com> writes: > > Hello > > I was trying to estimate the weibull model using nls after putting OLS > values as the initial inputs to NLS. > I tried multiple times but still i m getting the same error...

Dimitri Shvorob <dimitri.shvorob <at> gmail.com> writes: > > > Thank you very much, Erwin. If I may ask some follow-up questions > 1. GAMS <> R, ad it's just not entirely clear how to move the soltion to R. > (At most...