Hi,

I downloaded the perl script to calculate motion. I am agree with your definition which is max_absolute _value for each of the columns as Max_x. However, I am sorry to be confused with the code said "if( abs($x) > $max_x ) } {$max_x = $x}". When max_x becomes negative, any abs($x)> max_x  is correct and further max_x would be covered. Actually, I have calculated max_absolute _value for each of the columns on the individual rp.1D data and the results are different from the published motion.cvs excel file. 

Thanks so much for your reply