What is the algorithm used by svds function?

Hi, I want to compare the speed of a truncated SVD code with Lanczos Bidiagonalization method. In my search I realized that MATLAB SVDS code has two referrences to two of the works on Lanczos Bidiagonalization method. Can anyone tell me if SVDS uses Lanczos Bidiagonalization method? I need to be sure to start comparing my code with it.

Answer 1

[Bruno Luong]

svds is a MATFILE and it calls different methods depending on your inputs. You might step over and see if matlab.internal.math.LanczosBD is invoked.

[Hojjat Haghshenas Lari]

Thanks, but would you please explain how?

[Bruno Luong]

In command windows, type

edit svds

The search for "matlab.internal.math.LanczosBD" (there should be 2 instances)

then put a break point by clicking on "-" at left margin next to the line number.

Run your code that calls svds().

[Hojjat Haghshenas Lari]

Thanks for the answer.

[Christine Tobler]

If you type "edit svds", some papers are cited just after the help section.