Re: Obtaining terms in an expansion


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Re: Obtaining terms in an expansion

by trammell (Priest)

on Jan 05, 2006 at 23:19 UTC ( #521386=note: print w/replies, xml )

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in reply to Obtaining terms in an expansion

Does this do what you want?

my $n = $ARGV[0] || 5;
my @terms = qw( a[0][0] a[0][1] );
foreach my $i (1 .. $n-1) {
    @terms = map { ("$_ a[$i][0]","$_ a[$i][1]") } @terms;
}   
foreach my $i (0 .. $#terms) {
    print "term[$i] = $terms[$i]\n";
}
[download]

Update: fixed off-by-one error

Comment on Re: Obtaining terms in an expansion Download Code

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Re^2: Obtaining terms in an expansion by runrig (Abbot) on Jan 05, 2006 at 23:40 UTC
~~You have N terms going in, and N terms coming out.~~ He says in the OP that he wants 2^N expressions returned. This is considered 2 terms, so there are 4 expressions returned. Update: my mistake. Did not read carefully enough.	[reply]
Re^3: Obtaining terms in an expansion by trammell (Priest) on Jan 06, 2006 at 15:16 UTC
That's funny, because when I run the program for N=2, I get: `term[0] = a[0][0] a[1][0] a[2][0] term[1] = a[0][0] a[1][0] a[2][1] term[2] = a[0][0] a[1][1] a[2][0] term[3] = a[0][0] a[1][1] a[2][1] term[4] = a[0][1] a[1][0] a[2][0] term[5] = a[0][1] a[1][0] a[2][1] term[6] = a[0][1] a[1][1] a[2][0] term[7] = a[0][1] a[1][1] a[2][1]` [download] So perhaps I have an off-by-one error, but certainly I'm generating 2^N terms.	[reply] [d/l]

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