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: kevin.tho...@utoronto.ca Tel: 416.864.5776 Fax: 416.864.3016
On 2019-03-08, 7:39 AM, "R-help on behalf of akshay kulkarni"
<r-help-boun...@r-project.org on behalf of akshay...@hotmail.com> 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]]
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