Hi Alok, This isn't a question for the BioC listserv, as this has nothing to do with any BioC packages. Please direct these sorts of questions to R-help. And before you go to R-help and get pasted for not understanding the intricacies of floating point arithmetic in binary systems, please see http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think- these-numbers-are-equal_003f Best, Jim On 3/13/2012 9:41 AM, ALok wrote: > Dear R User, > I wrote a simple script in R, just to calculate the sum of the vector > > ################### > New<-function(n,old) > { > tt=0 > k=length(old) > for(i in 1:k) > { > # print(i) > tt=tt+old[i] > # print(tt) > } > print(tt) > print(n) > print(k) > if (n == tt){ > print ("A--Input is right") > } > if (n != tt){ > print ("B--Input is wrong") > } > } > ################### > > Now, I am testing it for two variable: > for > > n=13 > > old1= as.vector(c(2.8,2.8,2.8,1.1,0.7,2.8)) > and > # I have just swaped the 3rd and 4th variable > old2= c(2.8,2.8,1.1,2.8,0.7,2.8) > > # The first vector returns, >> New(n,old1) > [1] "B--Input is wrong" > > # While the second Vector returns, >> New(n,old2) > [1] "A--Input is right" > > Does anybody have some idea, Why is it so, Ideally both should be TRUE ????? > > Alok > > -- James W. MacDonald, M.S. Biostatistician University of Washington Environmental and Occupational Health Sciences 4225 Roosevelt Way NE, # 100 Seattle WA 98105-6099

Hi Alok, This isn't a question for the BioC listserv, as this has nothing to do with any BioC packages. Please direct these sorts of questions to R-help. And before you go to R-help and get pasted for not understanding the intricacies of floating point arithmetic in binary systems, please see http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think- these-numbers-are-equal_003f Best, Jim On 3/13/2012 9:41 AM, ALok wrote: > Dear R User, > I wrote a simple script in R, just to calculate the sum of the vector > > ################### > New<-function(n,old) > { > tt=0 > k=length(old) > for(i in 1:k) > { > # print(i) > tt=tt+old[i] > # print(tt) > } > print(tt) > print(n) > print(k) > if (n == tt){ > print ("A--Input is right") > } > if (n != tt){ > print ("B--Input is wrong") > } > } > ################### > > Now, I am testing it for two variable: > for > > n=13 > > old1= as.vector(c(2.8,2.8,2.8,1.1,0.7,2.8)) > and > # I have just swaped the 3rd and 4th variable > old2= c(2.8,2.8,1.1,2.8,0.7,2.8) > > # The first vector returns, >> New(n,old1) > [1] "B--Input is wrong" > > # While the second Vector returns, >> New(n,old2) > [1] "A--Input is right" > > Does anybody have some idea, Why is it so, Ideally both should be TRUE ????? > > Alok > > -- James W. MacDonald, M.S. Biostatistician University of Washington Environmental and Occupational Health Sciences 4225 Roosevelt Way NE, # 100 Seattle WA 98105-6099