I found out how to make it work - mulseq expects int while iterate
produces a list, so I have to map it on to the elements from iterate.
however, can someone explain the error? thanks!
On May 4, 10:34 pm, venkat <nivik...@gmail.com> wrote:
> i have a function that returns a seq of sets, each containing the
> digits corresponding to the multiples (2x...6x) for a given number
> like so:
>
> (defn mulseq [n]
> (let [n (int n)]
> (map #(set (str (* n %))) [2 3 4 5 6])))
>
> user> (mulseq 24)
> => (#{\4 \8} #{\2 \7} #{\6 \9} #{\0 \1 \2} #{\1 \4})
>
> (mulseq 1200)
> => (#{\0 \2 \4} #{\0 \3 \6} #{\0 \4 \8} #{\0 \6} #{\0 \2 \7})
>
> when i use this on single values, it works, but doesnt if i try to use
> it over a lazy sequence
>
> user> (take 3 (mulseq (iterate inc 5)))
> ; Evaluation aborted.
>
> clojure.lang.Cons cannot be cast to java.lang.Character
> [Thrown class java.lang.ClassCastException]
>
> Restarts:
> 0: [ABORT] Return to SLIME's top level.
>
> Backtrace:
> 0: clojure.lang.RT.intCast(RT.java:900)
> 1: user$mulseq__2095.invoke(NO_SOURCE_FILE:1)
> 2: user$eval__2176.invoke(NO_SOURCE_FILE:1)
> 3: clojure.lang.Compiler.eval(Compiler.java:4642)
> 4: clojure.core$eval__5254.invoke(core.clj:2031)
> 5: swank.commands.basic$eval_region__907.invoke(basic.clj:40)
> 6: swank.commands.basic$eval_region__907.invoke(basic.clj:31)
> 7: swank.commands.basic
> $eval__927$listener_eval__929.invoke(basic.clj:54)
> 8: clojure.lang.Var.invoke(Var.java:359)
> 9: user$eval__2173.invoke(NO_SOURCE_FILE)
> 10: clojure.lang.Compiler.eval(Compiler.java:4642)
> 11: clojure.core$eval__5254.invoke(core.clj:2031)
> 12: swank.core$eval_in_emacs_package__455.invoke(core.clj:59)
> 13: swank.core$eval_for_emacs__533.invoke(core.clj:128)
> 14: clojure.lang.Var.invoke(Var.java:367)
> 15: clojure.lang.AFn.applyToHelper(AFn.java:179)
> 16: clojure.lang.Var.applyTo(Var.java:476)
> 17: clojure.core$apply__4379.invoke(core.clj:434)
> 18: swank.core$eval_from_control__458.invoke(core.clj:66)
> 19: swank.core$eval_loop__461.invoke(core.clj:71)
> 20: swank.core$spawn_repl_thread__595$fn__627$fn__629.invoke(core.clj:
> 183)
> 21: clojure.lang.AFn.applyToHelper(AFn.java:171)
> 22: clojure.lang.AFn.applyTo(AFn.java:164)
> 23: clojure.core$apply__4379.invoke(core.clj:434)
> 24: swank.core$spawn_repl_thread__595$fn__627.doInvoke(core.clj:180)
> 25: clojure.lang.RestFn.invoke(RestFn.java:402)
> 26: clojure.lang.AFn.run(AFn.java:37)
> 27: java.lang.Thread.run(Thread.java:637)
>
> i'm sure this is trivial...please help. By way of additional context,
> i want to wrap this in (drop-until #(not (distinct? %)) ...) to find
> the first number whose 2x-6x multiples have the same set of digits in
> a different order. i realize there may be a hundred better ways to do
> this - n00b alert...
>
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