Re: ode45 function in package odepkg

[Ether Jones]

tmacchant wrote
> ----- Original Message -----
> 
>> From: Ether Jones 
>> To: help-octave
>> Date: 2018/12/11, Tue 13:29
>> Subject: ode45 function in package odepkg
>> 
>> Please, how to install odepkg package so I can access ode45() function?
>> 
>> On Octave 3.6.4 running on Windows, I get the following error message:
>> 
>> GNU Octave, version 3.6.4
>> Copyright (C) 2013 John W. Eaton and others.
>> Octave was configured for "i686-pc-mingw32".
>> 
>> octave-3.6.4.exe:1> clear all;
>> octave-3.6.4.exe:2>
>> octave-3.6.4.exe:2> fvdp = @(t,y) [y(2); (1 - y(1)^2) * y(2) - y(1)]
>> fvdp =
>> @(t, y) [y(2); (1 - y(1) ^ 2) * y(2) - y(1)]
>> 
>> octave-3.6.4.exe:3> [t,y] = ode45 (fvdp, [0, 20], [2, 0])
>> 
>> warning: Octave provides lsode for solving differential equations.  For
>> more
>> information try `help lsode'.  Matlab-compatible ODE functions are
>> provided by the odepkg package.  See
>> `http://octave.sourceforge.net/odepkg/'.
>> 
>> Please read `http://www.octave.org/missing.html' to learn how you can
>> contribute missing functionality.
>> 
>> error: 'ode45' undefined near line 3 column 10
>> octave-3.6.4.exe:3>
>> 
>> If I type pck install -forge odepkg I get this error message:
>> 
>> octave-3.6.4.exe:4> pkg install -forge odepkg
>> error: get_forge_pkg: could not read URL, please verify internet
>> connection
>> error: called from:
>> error:  
>> K:\OctaveVS\share\octave\3.6.4\m\pkg\private\get_forge_pkg.m 
>> at
>> line 77
>> , column 7
>> error:   K:\OctaveVS\share\octave\3.6.4\m\pkg\pkg.m 
>> at line 2414, column 15
>> error:   K:\OctaveVS\share\octave\3.6.4\m\pkg\pkg.m 
>> at line 374, column 32
>> octave-3.6.4.exe:4>
>> 
> Octave 3.6.4 is obsoleted.
> 
> Please use the latest version (octave-4.4.1)
> Octave 4.4.1 support ode45 as a core function
> 
> For install see
> http://wiki.octave.org/Octave_for_Microsoft_Windows
> 
> 
> Tatsuro

Seven Things:

1) Thank you for taking the time to reply.

2) I was aware of Octave 4.4.1 and its built-in support for ode45

3) Octave 4.4.1 does not install properly on my older desktop.  I get an
error about a non-existing entry point in a DLL

4) My existing older version, Octave 3.6.4, has worked beautifully for
years. But now I want to use ode45 for some problems I am studying.

5) The installation folder for my present installation of 3.6.4 has ode45.m
in it:
    K:\OctaveVS\share\octave\packages\odepkg-0.8.4\ode45.m

6) If the 3.6.4 installer put the odepkg-0.8.4 in the installation folder, I
assume it's there for a reason.

7) Can someone tell me how to access it?

Thank you.



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