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How to match both k and -k with sets? #821

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How to match both k and -k with sets?#821
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questionQuestion about FORMstaleNo recent activity. This may be closed if there is no further activity.

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@veretin
veretin
opened on Apr 28, 2026

Hi!

I want to match both +k and -k in one line with set restriction.
Is it possible? In this case "k" is a vector

v k,k1,k2, p, q;
set kk: k, k1, k2;
c A;

g ff1 = A(k);
g ff2 = A(-k);

id A(k?kk) = 0;
id A(-k?kk) = 0;

print;
.end

We need 2 lines to capture both. Can we do this in one line?
Regards,
OVeretin

Activity

  1. tueda commented on Apr 28, 2026

    @tueda
    tueda
    on Apr 28, 2026
    Collaborator

    Seems to work:

    V k,k1,k2,k3,k4,p;
Set kk: k1,k2,k4,-k1,-k3,-k4;
CF f;
L F =
#do k={k1,k2,k3,k4,-k1,-k2,-k3,-k4,p}
  + f(`k')
#enddo
;
id f(k?kk) = 0;
P +s;
.end

       F =
       + f(k3)
       + f(p)
       + f(-k2)
      ;
  2. jodavies
    added
    questionQuestion about FORM
    on Jul 6, 2026

  3. github-actions commented on Oct 5, 2026

    @github-actions
    github-actionsbot
    on Oct 5, 2026 – with GitHub Actions

    This issue has been marked as stale after 90 days of inactivity. It will be closed automatically in 30 days unless there is any further activity. If this issue is still relevant, please leave a comment to keep it open.

  4. github-actions
    added
    staleNo recent activity. This may be closed if there is no further activity.
    on Oct 5, 2026
  5. jodavies
    closed this as completedon Oct 5, 2026
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