Van Eck sequence: Difference between revisions
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</pre>
=={{header|ABC}}==
<syntaxhighlight lang="ABC">HOW TO RETURN vaneck.sequence length:
PUT {[1]: 0} IN seq
WHILE #seq < length:
PUT #seq-1 IN i
WHILE i>0 AND seq[i]<>seq[#seq]: PUT i-1 IN i
SELECT:
i=0: PUT 0 IN seq[#seq+1]
ELSE: PUT #seq-i IN seq[#seq+1]
RETURN seq
PUT vaneck.sequence 1000 IN eck
FOR i IN {1..10}: WRITE eck[i]>>4
WRITE /
FOR i IN {991..1000}: WRITE eck[i]>>4
WRITE /</syntaxhighlight>
{{out}}
<pre> 0 0 1 0 2 0 2 2 1 6
4 7 30 25 67 225 488 0 10 136</pre>
=={{header|Action!}}==
<syntaxhighlight lang="action!">INT FUNC LastPos(INT ARRAY a INT count,value)
Line 3,306 ⟶ 3,325:
First 10 terms: 8 0 0 1 0 2 0 2 2 1
Terms 991 through 1000: 16 183 0 6 21 10 249 0 5 48</pre>
=={{header|Refal}}==
<syntaxhighlight lang="refal">$ENTRY Go {
, <Eck 1000>: e.Eck
, <First 10 e.Eck>: (e.First10) e.Rest1
, <Last 10 e.Eck>: (e.Rest2) e.Last10
= <Prout e.First10>
<Prout e.Last10>;
};
Eck {
s.N = <Reverse <Repeat s.N EckStep>>;
};
Reverse {
= ;
e.X s.I = s.I <Reverse e.X>;
};
Repeat {
0 s.F e.X = e.X;
s.N s.F e.X = <Repeat <- s.N 1> s.F <Mu s.F e.X>>;
};
EckStep {
= 0;
s.N e.X, e.X: e.F s.N e.R,
<Lenw e.F>: s.M e.F = <+ s.M 1> s.N e.X;
s.N e.X = 0 s.N e.X;
};</syntaxhighlight>
{{out}}
<pre>0 0 1 0 2 0 2 2 1 6
4 7 30 25 67 225 488 0 10 136</pre>
=={{header|REXX}}==
Line 3,653 ⟶ 3,705:
vanEck(0..9) = 0 0 1 0 2 0 2 2 1 6
vanEck(990..999) = 4 7 30 25 67 225 488 0 10 136
=={{header|Uiua}}==
<syntaxhighlight lang="Uiua">
F ← ⊂⟨0◌|+1⟩>⊙(-1⧻),,⊗⊃⊢(↘1). # Generator function (prepends).
⇌⍥F999 [0] # Generate 1000 terms and flip.
⊃(&p↙¯)(&p↙∘)10 # Print first and last 10 terms.
</syntaxhighlight>
{{out}}
<pre>
[0 0 1 0 2 0 2 2 1 6]
[4 7 30 25 67 225 488 0 10 136]
</pre>
=={{header|Visual Basic .NET}}==
Line 3,734 ⟶ 3,798:
=={{header|Wren}}==
{{trans|Go}}
<syntaxhighlight lang="
var a = List.filled(max, 0)
var seen = {}
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