# length(GradedModule) -- length of a graded module

## Description

The length of a graded module is the difference between the largest and smallest indices of occupied spots. Chain complexes are graded modules, so this function applies to them, too.
 i1 : R = QQ[x..z]; i2 : C = res coker vars R 1 3 3 1 o2 = R <-- R <-- R <-- R <-- 0 0 1 2 3 4 o2 : ChainComplex i3 : length C o3 = 3