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<head><title>sequence -- make a sequence</title>
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<div><a href="index.html" title="">Macaulay2Doc</a> > <a href="___The_sp__Macaulay2_splanguage.html" title="">The Macaulay2 language</a> > <a href="_lists_spand_spsequences.html" title="">lists and sequences</a> > <a href="_sequence.html" title="make a sequence">sequence</a></div>
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<div><h1>sequence -- make a sequence</h1>
<div class="single"><h2>Synopsis</h2>
<ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>sequence v</tt></div>
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<li><div class="single">Inputs:<ul><li><span><tt>v</tt>, <span>a <a href="___Thing.html">thing</a></span></span></li>
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<li><div class="single">Outputs:<ul><li><span><span>a <a href="___Sequence.html">sequence</a></span>, <tt>v</tt> if <tt>v</tt> is a sequence, otherwise a sequence of length 1 containing <tt>v</tt></span></li>
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<div class="single"><h2>Description</h2>
<div><p>Such a function is needed occasionally to restore uniformity, because a nonempty parenthesized expression with no commas is not parsed as a sequence.</p>
<table class="examples"><tr><td><pre>i1 : sequence()
o1 = ()
o1 : Sequence</pre>
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<tr><td><pre>i2 : sequence(4)
o2 = 1 : (4)
o2 : Sequence</pre>
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<tr><td><pre>i3 : sequence(4,5)
o3 = (4, 5)
o3 : Sequence</pre>
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<tr><td><pre>i4 : identity()
o4 = ()
o4 : Sequence</pre>
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<tr><td><pre>i5 : identity(4)
o5 = 4</pre>
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<tr><td><pre>i6 : identity(4,5)
o6 = (4, 5)
o6 : Sequence</pre>
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<div class="single"><h2>See also</h2>
<ul><li><span><a href="_unsequence.html" title="extract the single element from a sequence of length 1">unsequence</a> -- extract the single element from a sequence of length 1</span></li>
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