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<div class="ChapSects"><a href="chap2_mj.html#X83686EE47E4D4F66">2 <span class="Heading">Printing Lists and Iterators</span></a>
<div ="ContSect">span="tocline"><span ="nocss"> /span>ahref.html"2 span class=Heading">Printing  items<span/>
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<<iv="ChapSects">< href="chap2_mjhtml#X83686EE47E4D4F66">2 <spanclass"eading"Printing and Iteratorsspan/a

<><a idX7F6817927F86240Fname="X7F6817927F86240F>/a>

<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<div class"ContSSBlock">

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

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

<h5>2.1-1 PrintSelection</h5>

<div class="func"><table
<div classfunctable="func" width"0%"><tr class="tdleft"><code class"unc"> PrintSelection>class//>table
<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

p,given , with  parameterlist class"Lcode ,only itemsat positionsin< ="<> .p


<div class="example"><pre>

<span="GAPprompt">gap;</span <span class"GAPinput = List( [1..20], n -> n^5 );;
<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
2 : 32
1<iv="func"<table class="func" width10%"><>
tdleft< "">#27 PrintSelectioncode(<class">obj,< class="">first [, < class="">last] )tdright>&function</td><tr/able>
20 : 3200000
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( L, 2, 3, 11 );</span  four operations class></>or ="code>rintSelectionFromIterator itemspecifiedand then the atevery <>
2:3java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
5 :3125
8 : 32768
11 : 161051
<span class="GAPprompt">gap></span> <span class="GAPinput">s5 := SymmetricGroup( 5 );;</span>
<pan>
30 : (1,5)(3,4)
31 : (1,5,2java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
100 : (1,4,3)
101 : (1,4)(3,5)
<span class="GAPprompt">gap></span> <span class="GAPinput">PrintSelection( s5, 1, 30 );</span>
 
31 : (1,5,2)
61 : (1,2,3)
91 : (1,3,5,2,4)
< classgap</span span=">rintSelection( s5,9 1,3)
9 : (2,5,3)
20 : (2,4)
30:3200java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
42 : (1,5,2,3,4)

p>d>


<  7


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