I'm no expert in R internals or floating point computation, however, two things come to mind.
First, I suspect the exact value is stored. It is just the printing that looks rounded. That is likely because 0.001 completely dominates the rest. To print in full precision, you would need over 200 digits for some of your values. Second, you may be pushing the limits of precision. It seems to me your original values are indistinguishable from zero. If they really represent materially different values, you might want to rescale them to improve computational reliability. -- Kevin E. Thorpe Head of Biostatistics, Applied Health Research Centre (AHRC) Li Ka Shing Knowledge Institute of St. Michael's Assistant Professor, Dalla Lana School of Public Health University of Toronto email: [email protected] Tel: 416.864.5776 Fax: 416.864.3016 On 2019-03-08, 7:39 AM, "R-help on behalf of akshay kulkarni" <[email protected] on behalf of [email protected]> wrote: dear members.... here is a piece of my code: > tail(YLf14,15) [1] 5.706871e-217 2.563877e-218 2.823295e-218 2.694622e-222 1.777409e-226 [6] 1.134403e-201 5.269464e-215 2.272121e-219 2.794970e-223 1.630978e-187 [11] 1.721529e-213 5.859815e-178 4.842612e-222 1.333685e-193 1.256051e-174 > YLf16 <- YLf14 + 0.001 > tail(YLf16,15) [1] 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 [13] 0.001 0.001 0.001 Is there any way to avoid the rounding off of YLf16 to 0.001, and take exact values? very many thanks for your time and effort...... yours sincerely, AKSHAY M KULKARNI [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
