Re: Passing Arguments From Java to Clojure
-- CallClojure.java --
import clojure.lang.RT;
import clojure.lang.Var;
import clojure.lang.PersistentVector;
public class CallClojure {
static PersistentVector toVec(int[][] arr) {
PersistentVector pv = PersistentVector.EMPTY;
for (int[] a : arr) {
PersistentVector temp = PersistentVector.EMPTY;
for (int n : a) {
temp = temp.cons(n);
}
pv = pv.cons(temp);
}
return pv;
}
public static void main(String[] args) throws Exception {
RT.loadResourceScript("foo.clj");
Var gimmie_vec = RT.var("foo", "gimmie-vec");
int[][] ar = {{1, 2}, {3, 4}, {5, 6}};
Object result = gimmie_vec.invoke(toVec(ar));
System.out.println(result);
}
}
-- foo.clj --
(ns foo)
(defn gimmie-vec [v]
(println "class:" (class v))
(println "v:" v))
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Re: Passing Arguments From Java to Clojure
Do you really need a Clojure vector-of-vectors, or do you just want an indexed collection of indexed collections? If the latter, you can simply use Java arrays, or ArrayMaps. ; build a collection a Java programmer might have made ; (I am not really going to go into Java just for an example... :-) (def x (into-array (map into-array [[1 2] [3 4]]))) => #'user/x ; function that destructures positional args (defn foo [[[a b] [c d]]] [a b c d]) => #'user/foo ; ta da (foo x) => [1 2 3 4] > There's a canonical intro on how to call or embed Clojure into Java: > http://en.wikibooks.org/wiki/Clojure_Programming/Tutorials_and_Tips#Invoking_Clojure_from_Java > > While this is a great introduction, the only thing Java passes in to > Clojure here is a string. I've tried methods where Java passes in > ints, and those work fine too. > > What I'm primarily concerned with is if there is some way to pass in a > list/vector/etc, if there's a particular way to format the argument on > the Java side so it can be easily converted on the Clojure side > without much hassle (via vector or something similar), or if I need to > just suck it up, pass in a string of numbers, and write a function on > the Clojure side that handles all that. > > To be specific, I would like to make a vector that would end up in > pairs: [[1 2] [3 4] [5 6]]. For those of you familiar with Incanter, > this will then become a dataset. > > Thanks in advance. > > -- > 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 -- 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
Re: Passing Arguments From Java to Clojure
Actually, just look at the main method (for testing) which has been commented out at the bottom - that will show you a better way to create and use it. On Jun 16, 9:37 am, allie wrote: > There's a canonical intro on how to call or embed Clojure into > Java:http://en.wikibooks.org/wiki/Clojure_Programming/Tutorials_and_Tips#I... > > While this is a great introduction, the only thing Java passes in to > Clojure here is a string. I've tried methods where Java passes in > ints, and those work fine too. > > What I'm primarily concerned with is if there is some way to pass in a > list/vector/etc, if there's a particular way to format the argument on > the Java side so it can be easily converted on the Clojure side > without much hassle (via vector or something similar), or if I need to > just suck it up, pass in a string of numbers, and write a function on > the Clojure side that handles all that. > > To be specific, I would like to make a vector that would end up in > pairs: [[1 2] [3 4] [5 6]]. For those of you familiar with Incanter, > this will then become a dataset. > > Thanks in advance. -- 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
Re: Passing Arguments From Java to Clojure
You need to pass in a PersistentVector of PersistentVector's. It's in clojure.lang and there are a number of static creation methods. On Jun 16, 9:37 am, allie wrote: > There's a canonical intro on how to call or embed Clojure into > Java:http://en.wikibooks.org/wiki/Clojure_Programming/Tutorials_and_Tips#I... > > While this is a great introduction, the only thing Java passes in to > Clojure here is a string. I've tried methods where Java passes in > ints, and those work fine too. > > What I'm primarily concerned with is if there is some way to pass in a > list/vector/etc, if there's a particular way to format the argument on > the Java side so it can be easily converted on the Clojure side > without much hassle (via vector or something similar), or if I need to > just suck it up, pass in a string of numbers, and write a function on > the Clojure side that handles all that. > > To be specific, I would like to make a vector that would end up in > pairs: [[1 2] [3 4] [5 6]]. For those of you familiar with Incanter, > this will then become a dataset. > > Thanks in advance. -- 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
