[petsc-users] MatViewAndMatlabLoad

[Oo]

Hi Jed,
The matrix file's structure likes
==============================
%Size = n n
%Nonzeros = m
zzz = zeros(m, 3);
zzz = [
***
***
***
***
... ...
];


Mat_0x84000000_0 = spconvert(zzz);
================================


How can I read this file in Matlab? 


Thanks,


Meng










------------------ Original ------------------
From:  "Jed Brown";<jed at jedbrown.org>;
Date:  Jul 18, 2014
To:  "Oo      "<wumeng07maths at qq.com>; "petsc-users"<petsc-users at mcs.anl.gov>; 

Subject:  Re: [petsc-users] MatViewAndMatlabLoad



Oo       <wumeng07maths at qq.com> writes:

> Dear All,
>
>
> I met a problem about using "load()" function in Matlab to read a m file which describes a PETSc Mat object by :
>  //Save coeff_matrix as a matlab file PetscViewer viewer; PetscViewerASCIIOpen(PETSC_COMM_WORLD,"CoeffMatrixFileName.m",&viewer); PetscViewerSetFormat(viewer, PETSC_VIEWER_ASCII_MATLAB); MatView(coeff_matrix, viewer); PetscViewerDestroy(&viewer);
> In Matlab, I used:M=load("CoeffMatrixFileName.m") and I got an error.The error is:???Error using ===> loadNumber of columns on line 2 of ASCII file CoeffMatrixFileName.m must be the same as previous lines.

What does the file look like?

Note that we recommend using a binary viewer and

  A = PetscBinaryRead('binaryoutput')

to read in MATLAB.  It is more accurate and much faster.

> Do you know how to deal with that error?Or Do you think there is some a mistake in my output of PETSc Mat Obj with the PetscViewer? 
> Thank you~:)
> Meng
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