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<P>
<LI> Modify, if necessary, these values by choosing the corresponding key and entering the requested information.
 <b> In particular</b>, key 10 is used to  indicate that the solution must be taken into account.
Once the desired state is obtained, type 0 to display the plot.
<P>
<LI> A graphics menu is available on the plot which enables the user to perform modifications to the plot, to
quit, or to return to the menu mentioned above.
<P>
</OL>
<P>
<P>
<P>
In practice, using preprocessor <b> ISOPXX</b>, the user indicates  to the module the different choices made from the                                       
possibilities offered.
<P>
The module computes the extrema corresponding to the mesh and solution automatically so that the
corners of the box in which the plot will be displayed can be defined.
<P>
<P>
<P>
The menu of ISOPIE (module called in this case) is identical to that  obtained for TRNOPO (module used
to plot a 2D mesh, to which the user is referred)
By activating key 10, we indicate that the solution must be considered after which the name of the file containing 
it must be entered. The enlarged menu is shown below;
<P>
<PRE> ------------------------------------------------------------
 | 10 | PLOT TYPE                 |  MESH AND ISOVALUES                   
 ------------------------------------------------------------
 | 11 | DEVICE NUMBER             |       1
 ------------------------------------------------------------
 | 12 | PLOT TITLE               |   piezo                                                                           
 ------------------------------------------------------------
 | 20 | D.S. NOPO TO PLOT         |  damian.nopo                                              
 ------------------------------------------------------------
 | 21 | S.D. B IN USE             |  damian.b                                                 
 ------------------------------------------------------------
 | 24 | LOAD CASE                 |       1
 ------------------------------------------------------------
 | 27 | ARRAY B4 SELECTED         |       1
 ------------------------------------------------------------
 | 28 | CLASSICAL PROBLEM         |  
 ------------------------------------------------------------
 | 32 | D.O.F. CHOSEN             |       1
 ------------------------------------------------------------
 | 25 | NUMBER OF ISOVALUES       |      20
 ------------------------------------------------------------
 | 26 | ISOVALUE CHOICE           |   MIN &lt; ** &lt; MAX                      
 ------------------------------------------------------------
 | 72 | ISOVALUES PLOT            |   COLOUR LINE                         
 ------------------------------------------------------------
 | 45 | COLOR SPECTRUM            |   STANDARD : RED -&gt; BLUE              
 ------------------------------------------------------------
 | 46 | SPECTRUM DIRECTION        |   DIRECT                              
 ------------------------------------------------------------
 | 34 | COLOR-VALUE IMPOSED       |   NO                                  
 ------------------------------------------------------------
 | 71 | ISOVALUES ARE POINTED     |   NO                                  
 ------------------------------------------------------------
 | 31 | QUESTIONS ABOUT A D.S.    |   NO                                  
 ------------------------------------------------------------
 | 30 | PLOT SIZE                 |  AUTO
 ------------------------------------------------------------
 | 40 | CHARACTER TYPE            |  HARD
 ------------------------------------------------------------
 | 50 | ITEMS TO PLOT             |  TRIANGULATION                        
 ------------------------------------------------------------
 | 60 | LEGEND                    |  YES                                  
 ------------------------------------------------------------
 | 70 | NUMBER                    |  NONE                                 
 ------------------------------------------------------------
 | 80 | LINE TYPE (MESH)          |  SOLID                                
 ------------------------------------------------------------
 | 80 | LINE TYPE (ISOVALUES)     |  SOLID                                
 ------------------------------------------------------------
</PRE>
<P>
A default value  is proposed for each option. 
The above table lists the selections made automatically. Type 0 to
obtain a plot.
<P>
A key (a number) and a status correspond to each item. To modify the status, it suffices to type the
key and enter the values corresponding to the status desired  (see the general introduction).
The general initial  menu  is identical to that obtained when using <b> TRNOXX</b>  in 2D.
By choosing, via key 10, to plot a solution, the menu described below is obtained:
<P>
<DL COMPACT><DT>Key 10:
<DD> the plot type: mesh  (default value), or by activating this key, the choice between:
<P>
<PRE>  
    MESH       : 0  --  ISOVALUES : 1
</PRE>
<P>
<DT>Key 11:
<DD> already seen.
<DT>Key 12:
<DD> already seen.
<DT>Key 20:
<DD> the name of the file containing the mesh (D.S. <b> NOPO</b>)
<DT>Key 21:
<DD> the name of the file containing the solution (D.S. <b> B</b>).
To change files, activate this key and enter the name of the new file to  be consider.
Activate this key to enter the new file names to be considered.
<DT>Key 24:
<DD> already seen.
<DT>Key 27:
<DD> already seen.
<DT>Key 28:
<DD> classical problem (by default), the isovalues  (pressure, etc.) of the solution are plotted. By
activating this key, the user changes to an interpretation of a piezometric problem (defined via key29).
<DT>Key 29:
<DD>  the type of plot (by default the pressure isovalues):
<PRE>    PRESSURE              : 1           
    PIEZOMETRIC HEAD      : 2
</PRE>
<DT>Key 32:
<DD> already seen.
<DT>Key 25:
<DD> already seen.
<DT>Key 26:
<DD> already seen.
<DT>Key 72:
<DD> already seen.
<DT>Key 45:
<DD> already seen.
<DT>Key 46:
<DD> already seen.
<DT>Key 71:
<DD> already seen.
<DT>Key 31:
<DD> by activating this key, we can &quot;inquire&quot; about the D.S. and obtain information regarding its contents.
<DT>Key 30:
<DD> the plot will be full screen, otherwise the user must specify the size in cm.
<DT>Key 40:
<DD> the type of characters plotted: hardware (by default), software if not. 
<DT>Key 50:
<DD> the choice of items to plot: the triangulation (by default). By activating this key, we have a choice
 between:
<PRE>  -- MESH 
     NOTHING                 : 0            
     TRIANGULATION           : 1            
     GEOMETRIC BOUNDARY      : 2
</PRE> 
<DT>Key 60:
<DD> the general legend (there is a legend by default) corresponds to the
indications appearing to the right of the plot (see examples: title, date, file name,...). 
<DT>Key 70:
<DD> already seen.
<DT>Key 80:
<DD> the type of plot lines desired for the mesh: solid (by default) or, by activating this key, the choice between:
<PRE>  

    SOLID      : 1  --   DOTTED    : 2           
    DASHED     : 3  --   MIXED     : 4 ?
</PRE> 
and the same choice for the isovalues.
<P>
 </DL>
<P>
<P>
<P>
Once a plot is displayed on the screen, a <i> graphics</i> menu appears, as for the other modules.
<P>
<DL COMPACT><DT>Example:
<DD>  It corresponds to an example taken from  [<A HREF="node109.html#damian">110</A>].
<P>
The plots were obtained  by typing the following sequences:
<P>
<UL><LI> figure <A HREF="#figtrisop1">6.4</A> :  -1  damian.nopo 10 1 damian.b 50 2 28 29 1 0  8 2 bw ncadre nlogo 
x12 y12  fisop1 v                             
<LI> figure <A HREF="#figtrisop2">6.5</A> :  (starting with the above plot) 1 29 2 71  0 8 2 bw ncadre nlogo 
x12 y12  fisop2 v                             
</UL>
By typing  72, and when using a color screen, we obtain a colored-in plot.
<P>
 </DL>
<P>
<P><A NAME=2896>&#160;</A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img126.gif">
<BR><STRONG>Figure 6.4:</STRONG> <i> Example <b> ISOPXX</b>: pressure</i><A NAME=2894iExample2890bISOPXXb2890pressurei2894>&#160;</A><BR>
<P>
<P>
<P><A NAME=2909>&#160;</A><IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img127.gif">
<BR><STRONG>Figure 6.5:</STRONG> <i> Example <b> ISOPXX</b>: piezometric head</i><A NAME=2907iExample2903bISOPXXb2903piezometricheadi2907>&#160;</A><BR>
<P>
<P>
<P>
<P>
<H2><A NAME=SECTION04753000000000000000>6.5.3 Eigenvalues and eigenvectors</A></H2>
<P>
<P>
<P>
To plot the eigenvalues of a problem, we use preprocessor
<b> CODEXX</b> to constructs a file from D.S. <b> VVPR</b> which is read
by  <b> TRACXX</b> to visualize the eigenvalues.
<P>
To plot the eigenvectors of a problem, we use preprocessor
<b> COBVXX</b> to construct a <b> B</b> structure from D.S. <b> VVPR</b>  containing one or
several vectors which is read by  <b> TRMCXX</b> to visualize the 
eigenvectors in the form of a deformation or velocity.
<P>
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