On 8/30/05, Chris Weed <chrisweed@gmail.com> wrote:
On 8/27/05, Peder Holt <peder.holt@gmail.com> wrote:
On 8/26/05, Chris Weed <chrisweed@gmail.com> wrote:
Hi, I was wonder what the plans are for the compile time double library, metamath. Is there a plan to develop compile time versions of the functions in math.h, such as sin, cos, pow, abs, etc.? Thanks, Chris
That was the plan, yes. An implementation of some math functions already exists under http://boost-sandbox.sourceforge.net/vault/ <expaler/mpl_math.zip> I have modified the sine function to work with the compile time double library, but the main problem has been lack of time. I will try to find time to implement more math metafunctions, but help is welcome.
Attached are implementations of sine and power (only integral exponents supported for now)
Regards, Peder
Hi, I would like to help out with this. Was the plan to implement most of the trigonometric functions with taylor expansions or some other algorithm?
Great! Thanks. I'll upload the source to the sandbox cvs. Cromwell has implemented cosine,sine and sqare root. I have rewritten his sine implementation to use the _double_double meta-operators. The idea is to use taylor expansions, but wherever there is another series that converge faster, this should of course be used. E.g. The only expansion I have found of pow(x,y) where x and y are floating point numbers, requires one to calculate the series of ln(x) and then exp(ln(x)*y). This is very costly. Regards, Peder
Chris
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