Hi,
I am developing an application that requires very large numbers, so I am
using BigDecimal.
I wanted to use atan, and saw that there was a bigdecimal/math, which
allows
you to use an atan that supports BigDecimal. However it seems faulty. It
says you cannot pass a value for x that is greater than 1 or less than
-1.
As far as I know, there is no such limit for the arctan. Also there is
no
asin or acos.
Are there any alternatives that support a bit more in terms of trig
functions?
Also, I wanted to ask whether there was any practical limit to the
precision
of a BigDecimal number? I’m looking at numbers in orders of magnitude
between about 15-25 at most.
Thanks,
Brandon
Brandon O. wrote:
I am developing an application that requires very large numbers, so I am
using BigDecimal.
Floats can handle pretty large numbers, too:
irb(main):009:0> 2.0 ** 1000
=> 1.07150860718627e+301
It’s more a question of how much precision you need.
On 2009-12-16, Brian C. wrote:
Brandon O. wrote:
I am developing an application that requires very large numbers, so
I am using BigDecimal.
Floats can handle pretty large numbers, too:
irb(main):009:0> 2.0 ** 1000
=> 1.07150860718627e+301
It’s more a question of how much precision you need.
Agreed, but these numbers will be used in calculations, so I feel a bit
more comfortable with BigDecimal.
The precision I need varies. It’ll use a lot of trig, and those should
be as exact as possible.
Brandon
Brandon O. [email protected] wrote:
says you cannot pass a value for x that is greater than 1 or less than -1.
As far as I know, there is no such limit for the arctan. Also there is no
Hi Brandon,
[-1,1] is basically all you need, since
arctan(x) = sgn(x) * Pi/2 - arctan(1/x)
Flo
Florian W. wrote:
arctan(x) = sgn(x) * Pi/2 - arctan(1/x)
Flo
sure, but this is just a feature special to arctan. It might be used for
implementation, but should not limit the set input values (i.e. its
interface)
regards
ralf