/usr/share/octave/packages/fpl-1.3.4/fpl_dx_write_field.m is in octave-fpl 1.3.4-2.
This file is owned by root:root, with mode 0o644.
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##
## This file is part of:
## FPL - Fem PLotting package for octave
##
## FPL is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## FPL is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with FPL; If not, see <http://www.gnu.org/licenses/>.
##
## author: Carlo de Falco <cdf _AT_ users.sourceforge.net>
## author: Massimiliano Culpo <culpo _AT_ users.sourceforge.net>
## -*- texinfo -*-
## @deftypefn {Function File} {} fpl_dx_writefield (@var{basename}, @
## @var{mesh}, @var{u}, @var{attr_name}, @var{attr_rank}, @
## @var{attr_shape}, @var{endfile})
##
## Output data field in ASCII Open-DX format.
##
## @var{basename} is a string containing the base-name of the dx file where the
## data will be saved.
##
## @var{mesh} is a PDE-tool like mesh, like the ones generated by the
## "msh" package.
##
## @var{u} is the field to be saved. It should represent scalar, vector
## or tensor of doubles.
##
## @var{attr_name} is a descriptive name for the field @var{u}, while
## @var{attr_rank} is the rank of the field (0 for scalar, 1 for vector,
## etc.) and @var{attr_shape} is the number of components of the field
## (assumed 1 for scalar).
##
## @var{endfile} should be 0 if you want to add other variables to the
## same file, 1 otherwise.
##
## Notice that when appending fields to an already existing file:
##
## @itemize
## @item @var{mesh} will not be printed to @var{filename}, but it will
## be only used to determine if the field is piece-wise constant or
## piece-wise linear
## @item @var{u} is not checked for consistency against the @var{mesh}
## already printed in @var{filename}
## @end itemize
##
## Example 1 (wrong usage):
## @example
## <generate msh1/u1 msh2/u2 in some way>
## fpl_dx_write_field("field.dx",msh1,u1,"density",1,0,0);
## fpl_dx_write_field("field.dx",msh2,u2,"temperature",1,0,1);
## @end example
## generate a file that fails at OpenDX run-time.
##
## Example 2:
## @example
## <generate msh1 and two fields u1-u2 in some way>
## fpl_dx_write_field("field",msh1,u1,"density",1,0,0);
## fpl_dx_write_field("field",msh1,u2,"temperature",1,0,1);
## @end example
## will generate a valid OpenDX ASCII data file.
##
## @seealso{fpl_dx_write_series}
##
## @end deftypefn
function fpl_dx_write_field(basename,mesh,u,attr_name,attr_rank,attr_shape,endfile)
## Check input
if nargin!=7
error("fpl_dx_write_field: wrong number of input");
endif
if !ischar(basename)
error("fpl_dx_write_field: basename should be a valid string");
elseif !( isstruct(mesh) )
error("fpl_dx_write_field: mesh should be a valid structure");
elseif !ismatrix(u)
error("fpl_dx_write_field: u should be a valid matrix");
elseif !ischar(attr_name)
error("fpl_dx_write_field: attr_name should be a valid string");
elseif !isscalar(attr_rank)
error("fpl_dx_write_field: attr_rank should be a valid scalar");
elseif !isscalar(attr_shape)
error("fpl_dx_write_field: attr_shape should be a valid scalar");
elseif !isscalar(endfile)
error("fpl_dx_write_field: endfile should be a valid scalar");
endif
filename = [basename ".dx"];
if ! exist(filename,"file")
## If file does not exist, create it
fid = fopen (filename,"w");
create = 1;
else
## FIXME: the following should be performed in a cleaner way! Does a
## backward fgetl function exist?
## If file exist, check if it was already closed
fid = fopen (filename,"r");
fseek(fid,-4,SEEK_END);
tst = fgetl(fid);
if strcmp(tst,"end")
error("fpl_dx_write_field: file %s exist and was already closed",filename);
endif
fclose(fid);
fid = fopen(filename,"a");
create = 0;
endif
p = mesh.p';
dim = columns(p); # 2D or 3D
if dim == 2
t = mesh.t(1:3,:)';
elseif dim == 3
t = mesh.t(1:4,:)';
else
error("fpl_dx_write_field: neither 2D triangle nor 3D tetrahedral mesh");
endif
nnodes = rows(p);
nelems = rows(t);
ndatas = rows(u);
if ndatas == nnodes
dep = "positions";
elseif ndatas == nelems
dep = "connections";
else
error("fpl_dx_write_field: neither position nor connection data type")
endif
if create
## If the file has just been created, print mesh information
print_grid(fid,dim,p,nnodes,t,nelems);
endif
## Otherwise assume the mesh is consistent with the one in the file
## and print only field information
print_data(fid,u,ndatas,dep,attr_name,attr_rank,attr_shape);
if(endfile)
fprintf(fid,"\nend\n");
endif
fclose (fid);
endfunction
## fprint a 2Dtrg or 3Dtet mesh
function print_grid(fid,dim,p,nnodes,t,nelems)
fprintf(fid,"object ""pos""\n");
fprintf(fid,"class array type float rank 1 shape %d items %d data follows",dim,nnodes);
for ii = 1:nnodes
fprintf(fid,"\n");
fprintf(fid," %1.7e",p(ii,:));
endfor
## In DX format nodes are
## numbered starting from zero,
## instead we want to number
## them starting from 1!
## Here we restore the DX
## format
if (min(min(t))==1)
t -= 1;
elseif(min(min(t))~=0)
error("fpl_dx_write_field: check triangle structure")
endif
fprintf(fid,"\n\nobject ""con""\n");
fprintf(fid,"class array type int rank 1 shape %d items %d data follows",dim+1,nelems);
for ii = 1:nelems
fprintf(fid,"\n");
fprintf(fid," %d",t(ii,:));
endfor
fprintf(fid,"\n");
if dim == 2
fprintf(fid,"attribute ""element type"" string ""triangles""\n");
elseif dim == 3
fprintf(fid,"\nattribute ""element type"" string ""tetrahedra""\n");
endif
fprintf(fid,"attribute ""ref"" string ""positions""\n\n");
endfunction
## fprint data on a trg grid
function print_data(fid,u,ndatas,dep,attr_name,attr_rank,attr_shape)
if ((attr_rank == 0) && (min(size(u))==1))
fprintf(fid,"object ""%s.data""\n",attr_name);
fprintf(fid,"class array type double rank 0 items %d data follows",ndatas);
fprintf(fid,"\n %1.7e",u);
else
fprintf(fid,"object ""%s.data""\n",attr_name);
fprintf(fid,"class array type double rank %d shape %d items %d data follows",attr_rank,attr_shape,ndatas);
for ii=1:ndatas
fprintf(fid,"\n");
fprintf(fid," %1.7e",u(ii,:));
endfor
endif
fprintf(fid,"\n");
fprintf(fid,"attribute ""dep"" string ""%s"" \n\n",dep);
fprintf(fid,"object ""%s"" class field\n",attr_name);
fprintf(fid,"component ""positions"" value ""pos""\n");
fprintf(fid,"component ""connections"" value ""con""\n");
fprintf(fid,"component ""data"" value ""%s.data""\n",attr_name);
fprintf(fid,"\n");
endfunction
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