java matrix liberary

Hi,
can anyone give me a link for downloading matrix calculation liberary (transpose,multiply,...) for java????

This was the first result Google gave me: JAMA: Java Matrix Package.

kind regards,

Jos

...or Apache Commons Math

thanks for all of you .. but can anyone tell me how to install it or in which folder should i place it???

Add the library to your classpath: Setting the class path

i tried but i couldnt set the path correctly... can anyone tell me easily where to place this liberaries??
my javac path is

C:\Program Files\Java\jdk1.6.0_24\bin

You don't set the PATH, you set the CLASSPATH - you can place the library wherever you want, as long as you tell javac and java where to find them, which the above link explains if you are compiling via the command line. If using an IDE, look at the documentation for your IDE

Don't forget the Colt package developed by CERN.