Tehseen, I'm not sure what you're referring to here.  But MASON has 
several grid facilities, including two-dimensional arrays, not just 
hashmaps.  Take a look at ObjectGrid2D.

Sean

Tehseen Zia wrote:
> Dear All,
> I want to implement reinforcement learning on Mason platform through dividing the whole grid into Grid spaces. Is there any way to implement grid spaces as you know Mason maintain Hash Map for the storage of coordinate system? Thanks you in advance.  
> 
> Best Regards
> Tehseen
> 
> -----Original Message-----
> From: MASON Multiagent Simulation Toolkit [mailto:[log in to unmask]] On Behalf Of Mike Landis
> Sent: Dienstag, 13. Jänner 2009 15:35
> To: [log in to unmask]
> Subject: Re: MASON 3D examples crashing w/ j3d installed (maybe)
> 
> Gabriel,
> 
> I appreciate the suggestions, but they're not working.  I fixed my 
> CLASSPATH so it included the lib directories of the jar files, but I 
> still got the error.  Then I put copies of the j3d jars in the MASON 
> directory (so there should be two ways to find them), but the 3d 
> examples still crash exactly the same way.  Any other ideas?
> 
> -Mike
> At 08:37 AM 1/13/2009, you wrote:
> 
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>>
>> you need the j3d jars in your classpath. On my windows box they're in
>> C:\j2sdk1.4.2\jre\lib\ext, so maybe you're missing the '\lib\ext' part at
>> the end.
>>
>> If you only want to run things, you can copy the jars in the MASON root
>> directory, or edit "start\mason.bat" and change "JAR_DIR"
>>
>> Gabriel
>>
>> On Mon, 12 Jan 2009 21:22:54 -0500, Mike <[log in to unmask]> wrote:
>>
>>> I'm trying to get Java and MASON installed properly.  I can run most of the
>>> examples, but the 3D examples all crash with this error:
>>>
>>>   java.lang.NoClassDefFoundError: javax/media/j3d/Node
>>>
>>> Java is installed at:  D:\Programs\Java\jdk1.6.0_11
>>> j3d is installed at:   D:\Programs\Java\jdk1.6.0_11\j3d-jre
>>>
>>>   JAVA_HOME = D:\Programs\Java\jdk1.6.0_11
>>>   CLASSPATH = .;D:\Programs\Java\jdk1.6.0_11
>>>
>>> Other directories under JAVA_HOME include
>>>   colt-1.2.0
>>>   jfreechart-1.0.12
>>>
>>> Got the error mentioned above.  Then I tried moved j3d, colt, and jfreechart
>>> under:
>>>   D:\Programs\Java\jdk1.6.0_11\jre
>>>
>>> Got the same error in MASON on the 3D examples.  What am I doing wrong?
>>> Should I have a CLASSPATH that specifies every directory that contains a jar
>>> file?
>>>
>>> Any suggestions would be much appreciated...
>>>
>>> -Mike
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