I figured out quickly that to implement this from scratch would be impossible for me within a two week timeframe, especially since i would need to understand the algorithm in detail.

I started searching for things that would help:

- Java Matrix packages: there seems to be alot of them out, a popular one is Jama, which is infact the matrix package used by Weka. Others include Matrix Toolkits for Java, Colt and JLAPack. None of these had a implementation of SVD based off the lanczos
- However there was a code out there that did implement lanczos unforuntantley not in Java. These include SVDPack and PROpack. It seemed that the scientific community still sticks to Fortran, C and Matlab for these matrix based solutions.
- I did look into calling a C or Matlab program from within Java , however it seemed more difficult than i thought .
- The Matlab program would require a MatLab runtime enviroment on the host machine in addition it would make the entire system dependent on Matlab.
- As for the C program the code was difficult to read and wasn't structured very well
- for the time being it doesn't look like this lanczos implementation can be done, its definitely doable but with only a few weeks left i would need to wrap it up quick so i can write the actual thesis.

I have meeting tommorow as usual and will discuss these issues.

## 2 comments:

We ported LIBSVDC to Java, mail if you need the source code (but I guess your deadline as long been passed :)

you have a nice site. thanks for sharing this site. there are various kinds of ebooks are available here

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