DSP Robotics Support

http://www.dsprobotics.com/support/viewforum.php?f=23
Here at 153 page has a Ruby code.(look at the file below)
I copyd(how to write it right?) the code and it's doesn't work.
What am I doing wrong?

You named the input exactly the same as the variable. They can't both have the same name. Rename the variable and it will work.

Yep, that's works. Thank you.