At 03:42 PM 26/10/2005, you wrote:
We can double check this with yacas which is a free
computer algebra system that supports arbitrary
precision math:
In N(Exp(-1000))
Out 0.5075958898e-434
Or in Axiom, which is open source too:
numeric exp(-1000)
0.50759588975494567653E-434 Type:
Dear All,
I am a novice user of the R software package. When I try and compute,
exp(-1000) or exp(-2000), i get the answer as zero. Is there any way i can get
R to compute the answer and give me an actual number ? ( by increasing the
precision or any other method).
If I cannot get R to give
Since log base 10 is log(x)/log(10) the exponent is:
floor(log(exp(-1000))/log(10))
= floor(-1000/log(10))
which in an R session gives:
floor(-1000/log(10))
[1] -435
and the mantissa is:
exp(-1000)/10^(-435)
= exp(-1000)/exp(-435*log(10))
