title: Cannot use libsvm in weka 3.7.10 after install it from weka package manager, on Windows
body: <p>guys</p>
  
  <p>I installed weka 3.7.10 (with jre1.7 included), and installed libsvm via its package manager.</p>
  
  <p>But when I use Explorer to open the data and try to choose a classifier, I found the "libSVM" under "classifiers -> functions" is grey and not usable (It chooseable actually, but when I choose it, the start button is disabled)</p>
  
  <p>I checked the folder of the downloaded packages, and I can see the libsvm.jar in "C:\Users\qsmile\wekafiles\packages\LibSVM\lib".</p>
  
  <p>So I add "C:\Users\qsmile\wekafiles\packages\LibSVM\lib\libsvm.jar" to the CLASSPATH environment variables, which is now ".;C:\Program Files (x86)\Java\jre7\lib\ext\QTJava.zip;C:\Users\qsmile\wekafiles\packages\LibSVM\lib\libsvm.jar", but it does not work.</p>
  
  <p>And I edited the "RunWeka.ini" file under the weka installed directory, and modified the last line into "cp=%CLASSPATH%;C:\\Users\\qsmile\\wekafiles\\packages\\LibSVM\\lib\\libsvm.jar". This change is according to the trouble shooting part on <a href="http://weka.wikispaces.com/LibSVM" rel="nofollow">http://weka.wikispaces.com/LibSVM</a>. After that, when use "java weka.core.SystemInfo" command to test, I can see the property java.class.path correctly shows the libsvm.jar in the right path. But, when I try to choose libsvm among classifiers, it is still grey and does not work.</p>
  
  <p>So, can anybody help me figure this out? Thanks a lot a lot a lot!</p>
  
  <p>My OS: Windows 7 SP1</p>