Code for the paper

• REDUCE with package SEGRE

  Example 3.5 (example.r) and Example 3.5 using the secant variety of S(3,3) (example_sec.r)
  Output files: out_example.r and out_example_sec.r

• CoCoA

  scroll.coc, needed (and loaded by the command Source "scroll.coc";) for the computation of Example 3.5 by example.coc or, using the secant variety of S(3,3), by example_sec.coc
  Output files: out_example.coc and out_example_sec.coc

• Macaulay2

  scroll.m2, needed (and loaded by the command load "scroll.m2") for the computation of Example 3.5 by example.m2 or, using the secant variety of S(3,3), by example_sec.m2
  Output files: out_example.m2 and out_example_sec.m2

• Singular

  scroll.s, needed (and loaded by the command < "scroll.s";) for the computation of Example 3.5 by example.s or, using the secant variety of S(3,3), by example_sec.s
  Output files: out_example.s (running Singular in quite mode: Singular -q < example_sec.s > out_example.s) and out_example_sec.s (running Singular not in quite mode; the difference to quite mode is less than 0.1 seconds)