Would be enough for me to know, where in the documentation i can find
which implemantation is valid to be instatiated. I imported
uncommons-math and haddop (which is needed for this "SparseVector"), but
stil it doesn't work.
import org.apache.mahout.clustering.dirichlet.UncommonDistributions;
import org.apache.mahout.matrix.SparseVector;
import org.apache.mahout.matrix.Vector;
public class Main {
public static void main(String[] args) {
Vector probabilities = new SparseVector();
probabilities.set(0, 0.1);
probabilities.set(1, 0.2);
probabilities.set(2, 0.3);
probabilities.set(3, 0.4);
// 100 Messpunkte
for(int i=0; i<100; i++) {
Vector newCoordinates = UncommonDistributions.rMultinom(100,
probabilities);
System.out.println(newCoordinates.size());
}
}
}
it throws the error:
Exception in thread "main" org.apache.mahout.matrix.IndexException
at org.apache.mahout.matrix.AbstractVector.set(AbstractVector.java:142)
at Main.main(Main.java:12)
Sean Owen wrote:
Well, sounds like you are loading classes that need Hadoop, and you
have not put Hadoop in your classpath.
These questions aren't particularly specific to Mahout -- I think
you'd benefit from learning a bit more about how Java works first.
It'll get you past a lot of small issues like this.
On Fri, Sep 4, 2009 at 11:55 PM, Sven Boekhoff<[email protected]> wrote:
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<[email protected]> 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<[email protected]> wrote:
But i cant create an Vector object:
Vector probabilities = new Vector();
gives an error.
