Hello Alex, Thanks for the detailed answer and thanks for PicoLisp!
-- Vijay On Wed, Aug 25, 2010 at 5:34 PM, Alexander Burger <a...@software-lab.de> wro= te: > Hi Vijay, > >> How can I do floating point arithmetic in PicoLisp? Is there an >> example of fixed-point division? > > As your question seems to correctly presume, there is no real floating > point arithmetic in PicoLisp. > > Fixed point numbers are actually scaled integer numbers. So a division > always requires a multiplication with the scale _before_ actually > dividing the numbers, and a multiplication needs a division by the scale > _after_ multiplying the arguments. > > In both cases, the '*/' function (muldiv) is normally used. In addition > to being faster than separate calls to '*' and '/', '*/' also rounds the > result. > > > For example: > > : (scl 6) =A0# Use a scale of 1000000 > -> 6 > > > # Division > : (*/ 17.0 1.0 3.0) =A0# Divide 17 by 3 > -> 5666667 > > : (format @ *Scl) =A0# See it as fixpoint > -> "5.666667" > > > # Multiplication > : (*/ 12.345 0.99 1.0) =A0# Multiply 12.345 with 0.99 > -> 12221550 > > : (format @ *Scl) > -> "12.221550" > > > As you see, the scale (1000000) can be specified conveniently as 1.0. > > Does this help? > > Cheers, > - Alex > -- > UNSUBSCRIBE: mailto:picol...@software-lab.de?subject=3dunsubscribe > -- UNSUBSCRIBE: mailto:picol...@software-lab.de?subject=unsubscribe
