Note for mkoctfile (and pkg install) for MSVC-octave 3.0.3

Introduction

To speed up solving the ODE or non-linear equations and many other problems, making ".oct" file is quite effective. The new octave manual for 3.0.x series gives much better description for the .oct file. However, Readme.txt in MSVC-octave, environmental descriptions to use the mkoctfile are not sufficient for beginners.

The setting is also required for 'pkg install' command. (Octave-forge package install command from a source tar.gz file.)

I hope this simple documents are useful for you.

Setting Details

Install MSVC-octave 3.0.3.

http://sourceforge.net/project/showfiles.php?group_id=2888&package_id=40078
I do not recommed to install in the "C:\program files" folder. The mkoctfile might not work. (I have not tried to install at "C:\program files" and carried out mkoctfile for 3.0.3) Full path of install folder might not have white space " ".

Install the MSVC++ 2008 Express edition

Microsoft Visual C++ 2008 Express Edition
Perhaps MSVC Express edition for other languages (Japanese, French, German, Italian, Korean, Japanese, Spanish) can be obtained. Please search it by the Google on your own language.

Prepare a startup batch file.

@echo off
rem example of a startup bacth file.

rem set MSVC environmental variable by calling vcvarsall.bat at Microsoft Visual Studio 9.0\VC
call "C:\Program Files\Microsoft Visual Studio 9.0\VC\vcvarsall.bat" > nul

rem "C:\Programs\Octave-3.0.3" is the folder where the octave has been installed.
"C:\Programs\Octave-3.0.3\bin\octave"


I think that it is better to make a shortcut to the batch file and customize it.

Examples after set up

Octave Screen Shot

octave:2> mkoctfile oregonator.cc
oregonator.cc
  Creating library oregonator.lib and object oregonator.exp
octave:3> system ('dir oregonator.oct');
 Volume in drive D has no label.
 Volume Serial Number is ACCF-78A8

 Directory of D:\usr\Tatsu\program\Octave\test

2008/11/25  12:24            10,240 oregonator.oct
               1 File(s)         10,240 bytes
               0 Dir(s)  35,543,801,856 bytes free
octave:4> testOrego2
ans =  0.23438
octave:5> mkoctfile oregonator.cc
oregonator.cc
LINK : fatal error LNK1104: cannot open file 'oregonator.oct'
octave:6> clear oregonator
octave:7> mkoctfile oregonator.cc
oregonator.cc
   Creating library oregonator.lib and object oregonator.exp
octave:8>  system ('dir oregonator.oct');
 Volume in drive D has no label.
 Volume Serial Number is ACCF-78A8

 Directory of D:\usr\Tatsu\program\Octave\test

2008/11/25  12:27            10,240 oregonator.oct
               1 File(s)         10,240 bytes
               0 Dir(s)  35,543,801,856 bytes free

*Please do not forget clear the function before the second, third, .... building from octave memory.
(In the above example, 'clear oregonator' is required. )

Source of testOrego2.m

  ## The test of `oregonator'.
  x0 = [ 4; 1.1; 4 ];
  % t = [0, logspace (-1, log10(303), 150), logspace (log10(304), log10(500), 150)];
  t=linspace(0,500,1000);
  ts=cputime();
  y = lsode ('oregonator', x0, t);
  cputime()-ts
  plot (t,y);
      

Source of oregonator.cc from the Octave Manual.

  #include  <octave/oct.h> 

  DEFUN_DLD (oregonator, args, ,
  "The `oregonator'.")
  {
    ColumnVector dx (3);
    ColumnVector x (args(0).vector_value ());
  
    dx(0) = 77.27 * (x(1) - x(0)*x(1) + x(0) - 8.375e-06*pow (x(0), 2));
    dx(1) = (x(2) - x(0)*x(1) - x(1)) / 77.27;
    dx(2) = 0.161*(x(0) - x(2));

    return octave_value (dx);
  }
     

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