Welcome to floating point math. As an alternative, try using arbitrary-precision numerics: user=> (- 12.305M 12.3049M) 0.0001M user=> (type *1) java.math.BigDecimal
On Oct 12, 9:17 am, cej38 <junkerme...@gmail.com> wrote: > I keep running into this type of problem: > > user=> (- 12.305 12.3049) > 9.999999999976694E-5 > > The computer (probably the JVM) has just lied to me. Any fourth grade > student will know that this does not equal 0.0001. This would be less > of a problem is the JVM was consistent; if it were consistent then the > following equality would be true: > > user=> (= 0.0001 (- 12.305 12.3049)) > false > > Now it has lied to me again! > > I need a method to reliably compare two numbers. My first choice > would be to have the JVM compute (- 12.305 12.3049) correctly. > Barring that, I need a way to, without fail, compute the truthfulness > of the following: =, <, >, <=, >=. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
