help for the first poster- a simple question
On 03/03/08 12:52, Xuejun Qin wrote:
Hi, there, I cannot get accurate value for calculation. for example: ld<-sqrt(1*0.05*0.95*0.05*0.95) 0.05*0.95-ld=-6.938894e-18 0.05*0.95-ld==0 is False. I met this problem in my program, how can I handle it. Thanks.
I think what you are experiencing is this: http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f (R FAQ "7.31 Why doesn't R think these numbers are equal?") Maybe handle it using round(). HTH m.