<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html
  SYSTEM "about:legacy-compat">
<html xmlns:mml = "http://www.w3.org/1998/Math/MathML" lang = "en"><head><meta charset = "UTF-8"/><meta name = "copyright" content = "(C) Copyright 2020"/><meta name = "DC.rights.owner" content = "(C) Copyright 2020"/><meta name = "DC.type" content = "concept"/><meta name = "description" content = "For extracting one scalar value from a field of analysis results for a number of group entities into one design response, it is necessary to combine these results using an operator (GROUP_OPER)."/><meta name = "DC.format" content = "HTML5"/><meta name = "DC.identifier" content = "tso-c-usr-terms-combTerms-groupOper-About"/><meta name = "DC.language" content = "en"/><link rel = "stylesheet" type = "text/css" href = "../DSDocUI_XML34.css"/><title>About Group Operations for Design Responses</title>
<script type = "text/javascript" src = "../DSDocUI_Highlight34.js">
  	/* */
  	</script></head><body onLoad = "highlightSearchTerms();" id = "tso-c-usr-terms-combTerms-groupOper-About">
<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>About Group Operations for Design Responses</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "shortdesc">
For extracting one scalar value from a field of analysis results for a number of
group entities into one design response, it is necessary to combine these
results using an operator (<code class = "ph codeph">GROUP_OPER</code>).

</p></td></tr></table></td></tr></table>




<div class = "body conbody">
<pre class = "codeblock">
<code class = "ph codeph">
DRESP
  ID_NAME        =
  DEF_TYPE       =
  TYPE           =
  UPDATE         =
  ND_GROUP       = &lt;<var class = "keyword varname varname">group_entities_for_combination</var>&gt;
  EL_GROUP       = &lt;<var class = "keyword varname varname">group_entities_for_combination</var>&gt;
  GROUP_OPER     = <span class = "ph uicontrol">MAX</span> | <span class = "ph uicontrol">MIN</span> | <span class = "ph uicontrol">AVERAGE</span>| <span class = "ph uicontrol">SUM</span> | <span class = "ph uicontrol">COUNT</span>
END_</code>
</pre>
<p>The following group operators exist:</p>
<ul class = "ul">
<li class = "li"><span class = "ph uicontrol">MAX</span>: extracts the maximum value within the
group</li>
<li class = "li"><span class = "ph uicontrol">MIN</span>: extracts the minimum value within the group</li>
<li class = "li"><span class = "ph uicontrol">AVERAGE</span>: extracts the average value within the group</li>
<li class = "li"><span class = "ph uicontrol">SUM</span>: sums up all values of the entities of
the group</li>
<li class = "li"><span class = "ph uicontrol">COUNT</span>: counts the number of entities of the group (cannot be used
for the design response, only applicable for variables)</li>
</ul>
<p>For the different types of terms, default settings for the operator exist.
For all displacement, forces, stresses, strains and other nodal values,
the default operator is <code class = "ph codeph">MAX</code>.</p>
<p>For all element-related entities (except the stresses and strains),
the default operator is <code class = "ph codeph">SUM</code>.</p>

<table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent"><ol class = "ol">
<li class = "li">It is recommended to specify the operator directly in order
to make sure that the correct settings are used.</li>
<li class = "li">Maximal 5000 design responses are allowed. Therefore, the maximal
number of nodes for <code class = "ph codeph">GROUP_OPER = MAX</code> is restricted to
5000, as internally there is created one design response for each node.</li>
<li class = "li">For sensitivity-based optimization, the objective function built from
design responses combining several entities (nodes) will be replaced
by a substitute expression built from the single design responses.
For <code class = "ph codeph">TARGET=MAX</code> this means that the sum of the single
design responses is optimized. For an example see <a class = "xref" href = "tso-c-usr-terms-combTermsGroupOperDispl.htm" title = "This chapter explains group operations for displacements.">Group Operations for Displacements</a>.</li>
<li class = "li">Not all group operators make sense for all kind of design responses. An overview which group operators are admitted for specific design responses can be found in
<a class = "xref" href = "tso-m-usr-terms-combTerms-drespCombi-sb.htm" title = "Creating response combinations like relative values, differences or mean values requires operations on a number of previously extracted design responses. For sensitivity-based topology optimization, only weighted sums are admitted in objective function and constraint definitions. For controller-based shape optimization, a large variety of other operators are admissible. All operators are available to create new responses for monitoring of optimization results.">Design Response Combination</a>.</li>
</ol></span></td></tr></table>

</div>



</td></tr></table><script type = "text/javascript" src = "../DSDocUI_Bottom34.js">/* */</script></body>
</html>
