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<head><title>map(ChainComplex,ChainComplex,Function) -- make a map of chain complexes</title>
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<div><a href="_map.html" title="make a map">map</a> > <a href="_map_lp__Chain__Complex_cm__Chain__Complex_cm__Function_rp.html" title="make a map of chain complexes">map(ChainComplex,ChainComplex,Function)</a></div>
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<div><h1>map(ChainComplex,ChainComplex,Function) -- make a map of chain complexes</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>map(C,D,f) or map(C,D,f,Degree=>d)</tt></div>
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<li><span>Function: <a href="_map.html" title="make a map">map</a></span></li>
<li><div class="single">Inputs:<ul><li><span><tt>C</tt>, <span>a <a href="___Chain__Complex.html">chain complex</a></span></span></li>
<li><span><tt>D</tt>, <span>a <a href="___Chain__Complex.html">chain complex</a></span></span></li>
<li><span><tt>f</tt>, <span>a <a href="___Function.html">function</a></span>, a function such that <tt>f(i)</tt> is a matrix <tt>D_i --> C_(i+d)</tt></span></li>
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<li><div class="single">Outputs:<ul><li><span><span>a <a href="___Chain__Complex__Map.html">chain complex map</a></span>, a map of chain complexes <tt>D --> C</tt></span></li>
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<li><div class="single"><a href="_using_spfunctions_spwith_spoptional_spinputs.html">Optional inputs</a>:<ul><li><span><a href="_map_lp..._cm_sp__Degree_sp_eq_gt_sp..._rp.html">Degree => ...</a>, -- set the degree of a map</span></li>
<li><span><a href="_map_lp__Ring_cm__Ring_cm__Matrix_rp.html">DegreeLift => ...</a>, -- make a ring map</span></li>
<li><span><a href="_map_lp__Ring_cm__Ring_cm__Matrix_rp.html">DegreeMap => ...</a>, -- make a ring map</span></li>
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<div class="single"><h2>Description</h2>
<div>If the degree d is not given, then d=0 is assumed.<p/>
The function <tt>f</tt> is called only for those indices that represent spots occupied in both the source and target chain complexes.</div>
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<div class="single"><h2>Caveat</h2>
<div>This function does not check that the maps <tt>f(i)</tt> commute with the differential of the chain complexes.</div>
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<div class="single"><h2>See also</h2>
<ul><li><span><a href="_extend.html" title="extend a module map to a chain map, if possible">extend</a> -- extend a module map to a chain map, if possible</span></li>
<li><span><a href="___Chain__Complex.html" title="the class of all chain complexes">ChainComplex</a> -- the class of all chain complexes</span></li>
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