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<div class="ChapSects"><a href="chap2.html#X83686EE47E4D4F66">2 <span class="Heading">Printing Lists and Iterators</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap2.html#X7F6817927F86240F">2.1 <span class="Heading">Printing selected items</span></a>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap2.html#X784638AC84D49870">2.1-1 PrintSelection</a></span>
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<h3>2 <span class="Heading">Printing Lists and Iterators</span></h3>

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<h4>2.1 <span class="Heading">Printing selected items</span></h4>

<p>The functions described here print lists or objects with an iterator with one item per line, either the whole list/iterator or certain subsets:</p>


<ul>
<li><p>by giving a list of positions of items to be printed, or</p>

</li>
<li><p>by specifying a first item and then a regular step.</p>

</li>
</ul>
<p><a id="X784638AC84D49870" name="X784638AC84D49870"></a></p>

<h5>2.1-1 PrintSelection</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ PrintSelection</code>( <var class="Arg">obj</var>, <var class="Arg">list</var> )</td><td class="tdright">( function )</td></tr></table></div>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ PrintSelection</code>( <var class="Arg">obj</var>, <var class="Arg">first</var>, <var class="Arg">step</var>[, <var class="Arg">last</var>] )</td><td class="tdright">( function )</td></tr></table></div>
<p>This function, given three (or four) parameters, calls operations <code class="code">PrintSelectionFromList</code> or <code class="code">PrintSelectionFromIterator</code> which prints the <em>first</em> item specified, and then the item at every <em>step</em>. The fourth parameter is essential when the object being printed is infinite.</p>

<p>Alternatively, given two parameters, with the second parameter a list <code class="code">L</code> of positive integers, only the items at positions in <code class="code">L</code> are printed.</p>


<div class="example"><pre>

<span class="GAPprompt">gap></span> <span class="GAPinput">L := List( [1..20], n -> n^5 );;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( L, [18..20] );</span>
18 : 1889568
19 : 2476099
20 : 3200000
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( L, 2, 9 );       </span>
2 : 32
11 : 161051
20 : 3200000
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( L, 2, 3, 11 );</span>
2 : 32
5 : 3125
8 : 32768
11 : 161051
<span class="GAPprompt">gap></span> <span class="GAPinput">s5 := SymmetricGroup( 5 );;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( s5, [30,31,100,101] );</span>
30 : (1,5)(3,4)
31 : (1,5,2)
100 : (1,4,3)
101 : (1,4)(3,5)
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( s5, 1, 30 );</span>
1 : ()
31 : (1,5,2)
61 : (1,2,3)
91 : (1,3,5,2,4)
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( s5, 9, 11, 43 );</span>
9 : (2,5,3)
20 : (2,4)
31 : (1,5,2)
42 : (1,5,2,3,4)

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