Section: FreeMat Functions
clock command, this function computes
the epoch time, i.e, the time in seconds since January 1,1970 
at 00:00:00 UTC.  This function is most useful for calculating elapsed
times using the clock, and should be accurate to less than a millisecond
(although the true accuracy depends on accuracy of the argument vector). 
The usage for clocktotime is
y = clocktotime(x)
where x must be in the form of the output of clock, that is
x = [year month day hour minute seconds]
clocktotime to time a delay of 1 second
--> x = clock
x = 
   1.0e+03 * 
    2.0090    0.0100    0.0040    0.0220    0.0260    0.0322 
--> sleep(1)
--> y = clock
y = 
   1.0e+03 * 
    2.0090    0.0100    0.0040    0.0220    0.0260    0.0332 
--> clocktotime(y) - clocktotime(x)
ans = 
    1.0010