Wolfram Fischer - Z/I/M
2002-May-28 06:00 UTC
[R] simplex (boot): solving A2 %*% x >= b2 not possible
When I want to solve a problem of the form A2 %*% x >= b2 I receive an error message allthough the problem is solvable: library(boot) A <- matrix( c(4,8,8,4), 2, 2 ) b <- c(9,9) a <- b simplex( a=a, A2=A, b2=b, maxi=F ) #-- # Error in rbind(iden(m1), zero(m2 + m3, m1)) : # attempt to set an attribute on NULL #== IN CONTRAST TO A CORRECT RESULT WHEN CALLING: simplex(a=a, A1=A, b1=b, maxi=T ) #-- # Optimal solution has the following values # x1 x2 # 0.75 0.75 # The optimal value of the objective function is 13.5. Wolfram Fischer -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Prof Brian D Ripley
2002-May-28 07:43 UTC
[R] simplex (boot): solving A2 %*% x >= b2 not possible
This is a bug in the boot package: in the original and not just in the port to R. Please report it to the author. On Tue, 28 May 2002, Wolfram Fischer - Z/I/M wrote:> When I want to solve a problem of the form A2 %*% x >= b2 > I receive an error message allthough the problem is > solvable: > > library(boot) > A <- matrix( c(4,8,8,4), 2, 2 ) > b <- c(9,9) > a <- b > > simplex( a=a, A2=A, b2=b, maxi=F ) > #-- > # Error in rbind(iden(m1), zero(m2 + m3, m1)) : > # attempt to set an attribute on NULL > > > #== IN CONTRAST TO A CORRECT RESULT WHEN CALLING: > > simplex(a=a, A1=A, b1=b, maxi=T ) > #-- > # Optimal solution has the following values > # x1 x2 > # 0.75 0.75 > # The optimal value of the objective function is 13.5. > > > Wolfram Fischer > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- > r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html > Send "info", "help", or "[un]subscribe" > (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch > _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._ >-- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._