PETSCVIEWERMATLAB#
A viewer that saves the variables into a MATLAB .mat file that may be read into MATLAB with load(‘filename’).
Notes#
Currently can only save PETSc vectors to .mat files, not matrices (use the PETSCVIEWERBINARY
and
${PETSC_DIR}/share/petsc/matlab/PetscBinaryRead.m to read matrices into MATLAB).
For parallel vectors obtained with DMCreateGlobalVector()
or DMGetGlobalVector()
the vectors are saved to
the .mat file in natural ordering. You can use DMView() to save the DMDA
information to the .mat file
the fields in the MATLAB loaded da variable give the array dimensions so you can reshape the MATLAB
vector to the same multidimensional shape as it had in PETSc for plotting etc. For example,
In your PETSc C/C++ code (assuming a two dimensional DMDA
with one degree of freedom per node)
PetscObjectSetName((PetscObject)x,"x");
VecView(x,PETSC_VIEWER_MATLAB_WORLD);
PetscObjectSetName((PetscObject)da,"da");
DMView(x,PETSC_VIEWER_MATLAB_WORLD);
Then from MATLAB
load('matlaboutput.mat') % matlaboutput.mat is the default filename
xnew = zeros(da.n,da.m);
xnew(:) = x; % reshape one dimensional vector back to two dimensions
If you wish to put the same variable into the .mat file several times you need to give it a new name before each call to view.
Use PetscViewerMatlabPutArray()
to just put an array of doubles into the .mat file
See Also#
PETSC_VIEWER_MATLAB_()
, PETSC_VIEWER_MATLAB_SELF
, PETSC_VIEWER_MATLAB_WORLD
, PetscViewerCreate()
,
PetscViewerMatlabOpen()
, VecView()
, DMView()
, PetscViewerMatlabPutArray()
, PETSCVIEWERBINARY
, PETSCVIEWERASCII
, PETSCVIEWERDRAW
,
PETSC_VIEWER_STDOUT_()
, PetscViewerFileSetName()
, PetscViewerFileSetMode()
, PetscViewerFormat
, PetscMatlabEngine
Level#
intermediate
Location#
src/sys/classes/viewer/impls/matlab/vmatlab.c
Index of all Viewer routines
Table of Contents for all manual pages
Index of all manual pages