cogfunctiontest.html

有限元学习研究用源代码(老外的),供科研人员参考

<TITLE>COG 1.0 - CogeometrySimpleFunction</TITLE>

<H2>class <A NAME="Function">CogeometrySimpleFunction</A></H2>

<PRE>
#include "<A HREF="cogfunction.hxx">cogfunction.hxx</A>"
</PRE>

 <P>Here we want to introduce a possibility to modify
cogeometries which is very variable - it allows to use the full power
of C++ as an input language for geometry definition.

 <P>This class allows you to define a cogeometry implicit, by any
floating point function f(x) and an 1D cogeometry. All what you need
is to understand how to obtain coordinates, region numbers and other
information from a point (<A HREF="wzpointtest.html">wzPoint</A>) and
how to create an <A HREF="cog1dtest.html">1D cogeometry</A>.

<PRE>
static cogFloat Function(const cogPoint& x)
{
 return 0.5*(x[1] - 1.5*x[2]*x[2] - 1.4*x[0]*x[0]*(x[0]-0.9))+0.3;
}
</PRE>

 <P>The function <B>Function</B> has to return a function value. It is
assumed to be continuous, the algorithm may work faster if it is
smooth.

<PRE>
cogeometry	test_cogeometry()
{
  cogeometry original = test_cogeometry_1();
  return new CogeometrySimpleFunction(<A HREF="#Function">Function</A>,original);
}

#ifdef test_cogeometry
this code can be used only in cogtest.cxx !!!!!  see test.html#parameters for more;
#endif
</PRE>