Hello,
although i programmed APL for a few years a long time ago, i am new to J.
I am trying to perform extended precision integer arithmetic.
T, a global has been assigned this value
10000000000000306999999999997669x
Then i perform this
x=:x:<.T^0.5
x
3162277660168428
The correct square root from another source is
3162277660168427.8729609771283143493714513369669538
so i would expect to get
316227766016842* 7* as the floor, not 316227766016842 *8*
from the result obtained, (3162277660168428)^2 is more than T, so it
would appear not to be the correct floor of square root of T.
How should i code to get 3162277660168427 for <.T^0.5?
(apart from subtracting 1 :-) )
I also computed */ for all primes up to 41 then up to 53 and tried to
get the residue of the result for each of the primes involved.
I expected to get zeroes, but for the cases ending at 53 i was getting
some non zero.
DP=:80, is there some other configuration variable that is relevant or
do i need to code these differently?
--
Regards,
Gerry J
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