Analyzing Accelerometer / Gyroscopic Data
If you already use Mathcad or Matlab, use those for the learning curve. 

If you are starting from scratch, then use Python, with mathplotlib for plotting, and numpy and possibly scipy for data analysis. These have the best learning curve, complete libraries, consistent behaviour across libraries, and will stand you in the best stead for the future. By comparison, Perl is inconsistent, C is just hard work.

You might want to have a little look first to see what you have with a spreadsheet.