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<TITLE>/</TITLE> |
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<A HREF = "index.html">[Index for ./FDCONT]</A> |
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<A HREF = "../index.html">[Return to Master Index]</A> |
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<H1>genbfd</H1> |
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<H2>(./FDCONT/genbfd.m)</H2> |
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<HR><H3>Function Synopsis</H3> |
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<pre>[xy,nnx,nny]=gen_fd_points(nx,ny,fem_grid_struct)</pre> |
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<HR><H3>Help text</H3> |
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<pre> |
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GENBFD generate a "basis function data" file for FD contouring |
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GENBFD computes an information file for contouring FEM |
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node-based data using FD sampled points and MATLAB's |
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contourf routine. The FD-based plotting tools are part |
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of the FDCONT toolkit. |
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Input: fem_grid_struct - FEM domain |
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xylist - FD point list (n X 2) or a 1x2 vector |
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containing [nx ny], the number of FD |
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points in (x,y) to discretize the area. |
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See below. |
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outflag - flag to output .bfd file to disk |
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if outflag==1, the bfd matrix is output to |
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the current directory with the name |
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<gridname>.bfd. |
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if outflag==0, the bfd matrix is returned |
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workspace. |
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bfdfilename - optional filename to write bfd matrix to. |
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Arguments 1-3 are required. |
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If xylist is passed in as [nx ny], GENBFD generates |
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the FD points convering an area equal to the |
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total extent of the FEM domain. If only 1 integer |
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is passed in, then nx=ny, GENBFD takes the smaller |
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of [(xmax-xmin),(ymax-ymin)] for equal spacing. |
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Output: The result of GENBFD is a matrix |
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containing the following information. |
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For each FD point: |
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x y elem n1 n2 n3 b1 b2 b3 depth |
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where x,y = FD point coordinate |
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elem = FE element containing x y (==0 if outside FE mesh) |
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n1,n2,n3 = node numbers of containing element (or closest) |
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b1,b2,b3 = basis function values (or 1 0 0 if outside FEM) |
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depth = depth at xy (or depth of closest node) |
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|
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For any given FD discretization, the bfd matrix need only be |
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computed once. The bfd matrix is passed to <A HREF = "../2.FDCONT/fe2fd.html">FE2FD</A> to perform |
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the actual FE to FD interpolation. |
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Call: bfd=genbdf(fem_grid_struct,xylist,outflag) |
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OR bfd=genbdf(fem_grid_struct,xylist,outflag,bfdfilename) |
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OR bfd=genbdf(fem_grid_struct,[nx ny],outflag,bfdfilename) |
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Written by: Brian Blanton (Spring 99) to implement |
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Chris Naimie's "bfd" file in MATLAB. |
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</pre> |
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<HR> |
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Produced by <A HREF="http://www.nd.edu/Courses/kantor/matlab/mat2html">mat2html</A> on Tue Feb 2 16:15:45 EST 1999 |
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