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How should I write this algorithm?

asked 2013-04-14 01:16:08 -0500

Neda gravatar image

updated 2013-04-14 01:26:35 -0500

hello I want to write this algorithm in sage, but I don't know how to write it as an algorithm in sage, could you please help me

Algorithm : update basis-update of intermediate basis G with reduct h Given: a finite set G_old ? B[X] and the reduct 0!=h ? B[X]

Find: updates G_new ? B[X] of G_old


1: G_new <-- Ø

2: while G_old !=Ø do

3: selecting from G_old ; G_old <-- G_old {g}

4: if HT(h) not divisible HT(g) then

5: G_new <-- G_new U {g}

6: end


8: G_new <-- G_new U {h}

9: return G_new


thank you so much

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answered 2013-04-15 00:35:34 -0500

Some of the code you wrote didn't make it. You should indent code so that it is displayed properly.

I don't exactly understand your algorithm, but from what I can grasp it might be something like this.

def update_basis(G,h):
    G_old = G.copy()
    G_new = []
    while G_old:
        g = G_old.pop()
        if ht(h) % ht(g):
    return G_new
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thank you so so much, I think I should learn python programming ..

Neda gravatar imageNeda ( 2013-04-15 06:37:59 -0500 )edit

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Asked: 2013-04-14 01:16:08 -0500

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Last updated: Apr 15 '13