[Swift-user] How to determine length of an array?

Thu Aug 2 12:53:41 CDT 2012

I cleaned this example up a bit and also tested @length() in trunk.

Both seem to work. The revised example is below.

- Mike

$ cat size.swift
type file;

app (file o) countargs (int v[])
{
  sh "-c" "echo $#" "" v stdout=@o;
}

(int s) sizeof (file fa[])
{
  int ia[];
  foreach f,i in fa {
    ia[i] = 1;
  }
  s = readData(countargs(ia));
}

file input_files[] <filesys_mapper; suffix=".txt">;

trace("length", @length( input_files ) ) ;

trace("size", sizeof(input_files));

$ ls -1 *.txt | wc -l
24
$ swift -tc.file tc size.swift
no sites file specified, setting to default: /home/wilde/swift/rev/trunk/etc/sites.xml
Warning: Procedure countargs is deprecated, at line 14
Warning: Procedure sizeof is deprecated, at line 21
Swift trunk swift-r5781 cog-r3368 (cog modified locally)

RunID: 20120802-1251-h7fvjrv7
 (input): found 24 files
Progress:  time: Thu, 02 Aug 2012 12:51:16 -0500
SwiftScript trace: length, 24
SwiftScript trace: size, 24
Final status: Thu, 02 Aug 2012 12:51:16 -0500  Finished successfully:1

$ 

----- Original Message -----
> From: "Michael Wilde" <wilde at mcs.anl.gov>
> To: "Thomas Uram" <turam at mcs.anl.gov>
> Cc: "swift user" <swift-user at ci.uchicago.edu>
> Sent: Thursday, August 2, 2012 12:29:00 PM
> Subject: Re: [Swift-user] How to determine length of an array?
> Hi Tom,
> 
> This should work. Its hopefully fixed in trunk, but if not, we should
> fix it there, quickly.
> 
> In the meantime, for moderate sized arrays you may be able to use the
> hack below as a temporary solution.
> 
> - Mike
> 
> ---
> 
> type file;
> 
> 
> app (file o) countArgs (int v[])
> {
> sh "-c" "echo $#" v stdout=@o;
> }
> 
> (int s) sizeOfFileArray (file fa[])
> {
> int ia[];
> foreach f,i in fa {
> ia[i] = 1;
> }
> s = readData(countArgs(ia));
> }
> 
> file input_files[] <filesys_mapper; suffix=".log">;
> 
> # trace( @length( input_files ) ) ;
> 
> trace("size", sizeOfFileArray(input_files));
> 
> 
> 
> ----- Original Message -----
> > From: "Thomas Uram" <turam at mcs.anl.gov>
> > To: "swift user" <swift-user at ci.uchicago.edu>
> > Sent: Thursday, August 2, 2012 11:23:30 AM
> > Subject: [Swift-user] How to determine length of an array?
> > Some functionality of my script is conditional based on the contents
> > of an array, so I need to determine the array length. The path
> > described by the documentation leads to an exception. How should I
> > determine array length? Or, a lesser requirement: how can I
> > determine
> > if an array is empty?
> >
> >
> > The user guide (
> > http://www.ci.uchicago.edu/swift/guides/trunk/userguide/userguide.html
> > ) says:
> >
> >
> > @length(array) will return the length of an array in Swift. This
> > function will wait for all elements in the array to be written
> > before
> > returning the length.
> >
> >
> > But the following Swift script:
> >
> >
> >
> > type file;
> > file input_files[] <filesys_mapper; suffix=".log">;
> > trace( @length( input_files ) ) ;
> >
> >
> > Produces this output:
> >
> >
> >
> > Swift 0.93 swift-r5483 cog-r3339
> >
> >
> > RunID: 20120802-1218-5dfj571d
> > (input): found 255 files
> > Progress: time: Thu, 02 Aug 2012 12:18:51 -0400
> > Execution failed:
> > java.lang.ClassCastException:
> > org.griphyn.vdl.mapping.RootArrayDataNode cannot be cast to
> > java.util.Map
> > at
> > org.griphyn.vdl.karajan.lib.swiftscript.Misc.swiftscript_length(Misc.java:399)
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > at
> > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > at
> > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> > at java.lang.reflect.Method.invoke(Method.java:597)
> > at
> > org.globus.cog.karajan.workflow.nodes.functions.FunctionsCollection.function(FunctionsCollection.java:82)
> > at
> > org.globus.cog.karajan.workflow.nodes.functions.AbstractFunction.post(AbstractFunction.java:27)
> > at
> > org.globus.cog.karajan.workflow.nodes.AbstractSequentialWithArguments.completed(AbstractSequentialWithArguments.java:194)
> > at
> > org.globus.cog.karajan.workflow.nodes.FlowNode.complete(FlowNode.java:214)
> > at
> > org.globus.cog.karajan.workflow.nodes.FlowContainer.post(FlowContainer.java:58)
> > at
> > org.globus.cog.karajan.workflow.nodes.functions.AbstractFunction.post(AbstractFunction.java:28)
> > at
> > org.globus.cog.karajan.workflow.nodes.Sequential.startNext(Sequential.java:29)
> > at
> > org.globus.cog.karajan.workflow.nodes.Sequential.executeChildren(Sequential.java:20)
> > at
> > org.globus.cog.karajan.workflow.nodes.FlowContainer.execute(FlowContainer.java:63)
> > at
> > org.globus.cog.karajan.workflow.nodes.FlowNode.restart(FlowNode.java:139)
> > at
> > org.globus.cog.karajan.workflow.nodes.FlowNode.start(FlowNode.java:197)
> > at
> > org.globus.cog.karajan.workflow.FlowElementWrapper.start(FlowElementWrapper.java:227)
> > at
> > org.globus.cog.karajan.workflow.events.EventBus.start(EventBus.java:104)
> > at
> > org.globus.cog.karajan.workflow.events.EventTargetPair.run(EventTargetPair.java:40)
> > at
> > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> > at
> > java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> > at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> > at
> > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> > at
> > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> > at java.lang.Thread.run(Thread.java:619)
> >
> >
> > _______________________________________________
> > Swift-user mailing list
> > Swift-user at ci.uchicago.edu
> > https://lists.ci.uchicago.edu/cgi-bin/mailman/listinfo/swift-user
> 
> --
> Michael Wilde
> Computation Institute, University of Chicago
> Mathematics and Computer Science Division
> Argonne National Laboratory
> 
> _______________________________________________
> Swift-user mailing list
> Swift-user at ci.uchicago.edu
> https://lists.ci.uchicago.edu/cgi-bin/mailman/listinfo/swift-user

-- 
Michael Wilde
Computation Institute, University of Chicago
Mathematics and Computer Science Division
Argonne National Laboratory