Hello, yes, toString is global. However, this problem has nothing to do
with toString.
However, a is a DistArray. a(point) attempts to access the point'th
location of a. This location, per the distribution yu gave when you
created the DistArray, is not located at the place where you are
performing the access.
Hence you get a BadPlaceException.
Hope this helps,
Best,
Vijay
李伟 wrote:
> Hi:
>
> I've written a x-10 problem as follows:
>
> public class Fun2
> {
> public static def main(argv:Rail[String]!) =
> {
> val a : DistArray[Int]
> =
> DistArray.make[Int](Dist.makeBlock(1..35),((i):Point)=>i*i);
> x10.io.Console.OUT.println(str(a));
> }
>
> static def str[T](a:DistArray[T]):String {
> var s : String = "";
> var first : Boolean = true;
> for(point in a)
> {
> if (first) first = false;
> else s += ",";
> s += a(point).toString();
> }
> return s;
> }
> }
>
> It can be compiled. And when running, the program crashed. The output info
> is as follows:
>
> x10.lang.BadPlaceException: point (10) not defined at (Place 0)
> at x10.array.DistArray$2.apply(DistArray.java:613)
> at x10.array.DistArray$2.apply(DistArray.java:1)
> at x10.array.BaseRegion.check(BaseRegion.java:120)
> at x10.array.DistArray.checkPlace(DistArray.java:1407)
> at x10.array.DistArray.apply(DistArray.java:998)
> at Fun2.str(Fun2.java:149)
> at Fun2.main(Fun2.java:106)
> at Fun2$Main$2.apply(Fun2.java:51)
> at x10.lang.Runtime$5.apply(Runtime.java:4454)
> at x10.lang.Activity.run(Activity.java:217)
> at x10.lang.Runtime$Worker$3.apply(Runtime.java:3455)
> at x10.runtime.impl.java.Runtime.runAt(Runtime.java:105)
> at x10.lang.Runtime$Worker.loop(Runtime.java:3422)
> at x10.lang.Runtime$Worker.apply(Runtime.java:3308)
> at x10.lang.Runtime$Pool.apply(Runtime.java:3842)
> at x10.lang.Runtime.start(Runtime.java:4461)
> at Fun2$Main.main(Fun2.java:34)
> at x10.runtime.impl.java.Runtime.run(Runtime.java:50)
> at java.lang.Thread.run(Unknown Source)
>
> When changing the sentence:
> s += a(point).toString();
> into the new form:
> s += at(a.dist(point)){a(point).toString()};
> it runs well.
>
> In my opinion, toString is global. And therefore I don't need to use the
> "at" clause. Are there any problems here?
>
> Best regards,
> Wei Li
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