*** empty log message ***

tutorial/tutorial.html

@@ -22,7 +22,7 @@
 <H1>README 1/9</H1>
 [<A HREF="#top">top</A>][prev][<A HREF="#file2">next</A>]
 <PRE>
-$Id: tutorial.html,v 1.2 2000-12-10 15:08:32 geuzaine Exp $
+$Id: tutorial.html,v 1.3 2000-12-11 22:15:53 geuzaine Exp $
 
 Here are the examples in the Gmsh tutorial. These examples are
 commented (both C and C++-style comments can be used in Gmsh input
@@ -560,7 +560,7 @@ Physical Surface(2) = {24};
  *
  *  Gmsh tutorial 5
  * 
- *  Characteristic lengths, Functions, Loops
+ *  Characteristic lengths, Arrays of variables, Functions, Loops
  *
  *********************************************************************/</FONT></I>
 
@@ -660,13 +660,21 @@ Function CheeseHole
   l7 = newreg; Line Loop(l7) = {c2,c7,c12};   Ruled Surface(newreg) = {l7};
   l8 = newreg; Line Loop(l8) = {-c6,-c9,c2};  Ruled Surface(newreg) = {l8};
 
-  l9 = newreg; Surface Loop(l9) = {l8+1, l5+1, l1+1, l2+1, -(l3+1), -(l7+1), l6+1, l4+1};
-  thehole = newreg; Volume(thehole) = {l9};
+<I><FONT COLOR="#B22222">// Arrays of variables can be manipulated in the same way as classical
+</FONT></I><I><FONT COLOR="#B22222">// variables. Warning: accessing an uninitialized element in an array
+</FONT></I><I><FONT COLOR="#B22222">// will produce an unpredictable result.
+</FONT></I>
+  theloops[t] = newreg ; 
+
+  Surface Loop(theloops[t]) = {l8+1, l5+1, l1+1, l2+1, -(l3+1), -(l7+1), l6+1, l4+1};
+
+  thehole = newreg ; 
+  Volume(thehole) = theloops[t] ;
 
 Return
 
 
-x = 0; y = 0.75; z = 0; r = 0.09;
+x = 0 ; y = 0.75 ; z = 0 ; r = 0.09 ;
 
 <I><FONT COLOR="#B22222">// A For loop is used to generate five holes in the cube:
 </FONT></I>
@@ -679,27 +687,37 @@ For t In {1:5}
 </FONT></I><I><FONT COLOR="#B22222">// defining a function, we could have define a file containing the
 </FONT></I><I><FONT COLOR="#B22222">// same code, and used the Include command to include this file.
 </FONT></I>
-  Call CheeseHole;
+  Call CheeseHole ;
 
 <I><FONT COLOR="#B22222">// A physical volume is defined for each cheese hole
 </FONT></I>
   Physical Volume (t) = thehole ;
  
 <I><FONT COLOR="#B22222">// The Printf function permits to print the value of variables on the
-</FONT></I><I><FONT COLOR="#B22222">// terminal:
+</FONT></I><I><FONT COLOR="#B22222">// terminal, in a way similar to the 'printf' C function:
 </FONT></I>
-  Printf(&quot;The cheese hole has number %g!&quot;, thehole);
+  Printf(&quot;The cheese hole %g (center = {%g,%g,%g}, radius = %g) has number %g!&quot;,
+	 t, x, y, z, r, thehole) ;
 
+<I><FONT COLOR="#B22222">// Note: All Gmsh variables are treated internally as double precision
+</FONT></I><I><FONT COLOR="#B22222">// numbers. The format string should thus only contain valid double
+</FONT></I><I><FONT COLOR="#B22222">// precision number format specifiers (see the C or C++ language
+</FONT></I><I><FONT COLOR="#B22222">// reference for more details).
+</FONT></I>
 EndFor
 
 <I><FONT COLOR="#B22222">// This is the surface loop for the exterior surface of the cube:
 </FONT></I>
-Surface Loop(185) = {35,31,29,37,33,23,39,25,27};
+theloops[0] = newreg ;
+
+Surface Loop(theloops[0]) = {35,31,29,37,33,23,39,25,27} ;
 
 <I><FONT COLOR="#B22222">// The volume of the cube, without the 5 cheese holes, is defined by 6
-</FONT></I><I><FONT COLOR="#B22222">// surface loops (the exterior surface and the five interior loops):
+</FONT></I><I><FONT COLOR="#B22222">// surface loops (the exterior surface and the five interior loops).
+</FONT></I><I><FONT COLOR="#B22222">// To reference an array of variables, its identifier is followed by
+</FONT></I><I><FONT COLOR="#B22222">// '[]':
 </FONT></I>
-Volume(186) = {185,184,155,126,97,68};
+Volume(186) = {theloops[]} ;
 
 <I><FONT COLOR="#B22222">// This physical volume assigns the region number 10 to the tetrahedra
 </FONT></I><I><FONT COLOR="#B22222">// paving the cube (but not the holes, whose elements were tagged from
@@ -1040,8 +1058,8 @@ General.Axes = 0 ;
 </FONT></I>
 PostProcessing.View[0].Name = &quot;This is a very stupid demonstration...&quot; ;
 PostProcessing.View[0].IntervalsType = 2 ;
-PostProcessing.View[0].Offset = {0,0,0.05} ;
-PostProcessing.View[0].Raise = {0,0,0} ;
+PostProcessing.View[0].Offset2 = 0.05 ;
+PostProcessing.View[0].Raise2 = 0 ;
 PostProcessing.View[0].Light = 1 ;
 
 PostProcessing.View[1].Name = &quot;...of Gmsh's scripting capabilities&quot; ;
@@ -1063,7 +1081,7 @@ For num In {1:255}
 
   t = (PostProcessing.View[0].TimeStep &lt; PostProcessing.View[0].NbTimeStep-1) ? t+1 : 0 ;
   
-  PostProcessing.View[0].Raise += {0,0,0.001*t} ;
+  PostProcessing.View[0].Raise2 += 0.001*t ;
 
 <I><FONT COLOR="#B22222">// It is possible to nest loops:
 </FONT></I>
@@ -1082,6 +1100,11 @@ For num In {1:255}
 </FONT></I>
   If (!(num % 20))
 
+<I><FONT COLOR="#B22222">// The Sprintf function permits to create complex strings using
+</FONT></I><I><FONT COLOR="#B22222">// variables (since all Gmsh variables are treated internally as
+</FONT></I><I><FONT COLOR="#B22222">// double precision numbers, the format should only contain valid
+</FONT></I><I><FONT COLOR="#B22222">// double precision number format specifiers):
+</FONT></I>
     Print Sprintf(&quot;t8-%g.gif&quot;, num); <I><FONT COLOR="#B22222">// print the scene in a gif file
 </FONT></I>
   EndIf