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From Sven Boekhoff <s...@boekhoff.info>
Subject Re: Creating Multinomial Random numbers with Mahout
Date Fri, 04 Sep 2009 22:55:06 GMT
It does nor work.
It throws the error:

Exception in thread "main" java.lang.NoClassDefFoundError: 
org/apache/hadoop/io/Writable
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.io.Writable
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
	... 12 more
Could not find the main class: Main.  Program will exit.

Do I need the hadoop library? This is not written in the requirements,...


Sean Owen wrote:
> I think you probably want to study basic Java first then or you're
> going to run into a lot more confusion.
> 
> Vector probabilities = new SparseVector();
> 
> is what you want. Interfaces and instantiating objects are the very
> basics of Java.
> 
> On Fri, Sep 4, 2009 at 5:30 PM, Sven Boekhoff<sven@boekhoff.info> wrote:
>> I never worked with interfaces.
>> And i also don't know what "instantiate an implementation" means.
>> How does it look like?
>>
>> Sean Owen wrote:
>>> Yes, Vector is an interface! You need to instantiate an implementation
>>> like DenseVector.
>>>
>>> On Fri, Sep 4, 2009 at 5:25 PM, Sven Boekhoff<sven@boekhoff.info> wrote:
>>>> But i cant create an Vector object:
>>>>
>>>> Vector probabilities = new Vector();
>>>>
>>>> gives an error.
>>>>

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