Return the size of a coordinate trace.
l=size(t)
When applied to an imat_ctrace object, the SIZE function returns the size of the coordinate trace (i.e., the number of coordinates).
>> t=imat_ctrace('1x','2x','3x','4x')
t =
'1X+'
'2X+'
'3X+'
'4X+'
>> size(t)
ans =
4 1
>>