# This file is part of the Test Set for BVP solvers # # http://www.dm.uniba.it/~bvpsolvers/ # # Problem bvpT21 # ODE of dimension 2 # # DISCLAIMER: see # http://www.dm.uniba.it/~bvpsolvers/testsetbvpsolvers # bvpT21_ho<- function(){ prob<- function(){ fullnm <- 'Problem bvpT21' problm = 'bvpT21' typebvp = 'SPBVP' neqn = 1 nlbc = 1 aleft = 0 aright = 1 numjac = FALSE numbcjac = FALSE linear = FALSE Rpar<-c(0.5) Ipar<-0 ms <- rep(2,neqn) return(list(fullnm=fullnm,problm=problm,typebvp=typebvp,neqn=neqn, nlbc=nlbc,ms=ms,aleft=aleft,aright=aright,Rpar=Rpar,Ipar=Ipar, numjac=numjac,numbcjac=numbcjac,linear=linear)) } init <- function(neqn,ms,aleft,aright) { givmsh = TRUE givey = TRUE nmsh = 11 xguess = seq(aleft,aright,by=(aright-aleft)/(nmsh-1)) yguess <- NULL for (i in 1:neqn) for (j in 1:ms[i]) yguess <- rbind(yguess,rep(0,nmsh)) return(list(givmsh=givmsh,givey=givey, nmsh=nmsh,xguess=xguess,yguess=yguess)) } feval = function(x,y,eps,Rpar,Ipar){ f <- c((y[1]*(1.e0+y[1])-exp((-2.e0*x)/eps))/(eps*eps)) return(list(f)) } jeval = function(x,y,eps,Rpar,Ipar){ dfy <- matrix( nrow=1,ncol=2,byrow = TRUE, data = c( (1.e0+2.e0*y[1])/(eps*eps),0)) return((dfy)) } bceval <- function(i, y, eps,Rpar,Ipar) { if (i == 1) return(y[1]-1.e0) if (i == 2) return(y[1]-exp(-1/eps)) } dbceval <- function(i, y, eps,Rpar,Ipar) { if (i == 1) return(c(1, 0)) if (i == 2) return(c(1, 0)) } setoutput<- function(neqn,plotsol=NULL){ solref = FALSE if (is.null(plotsol)){ nindsol = neqn indsol = 1;neqn } else{ nindsol = length(plotsol) indsol = plotsol } return(list(solref=solref,nindsol=nindsol,indsol=indsol)) } esolu <- function(X,parms,Rpar,Ipar){ lambda=parms Exact =matrix( c( exp(-X/(lambda)), (-exp(-X/(lambda)))/(lambda)), ncol=2,nrow=length(X),byrow=FALSE) return(Exact=Exact) } return(list(prob=prob,init=init,feval=feval,jeval=jeval,bceval=bceval,dbceval=dbceval,setoutput=setoutput,esolu=esolu)) }