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MathGroup Archive 2002

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Re: Request for Mathematica Programming help.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg36919] Re: Request for Mathematica Programming help.
  • From: guillerm at aida.usal.es (Guillermo Sanchez)
  • Date: Wed, 2 Oct 2002 03:31:51 -0400 (EDT)
  • References: <an14fb$idu$1@smc.vnet.net> <200209280834.EAA24968@smc.vnet.net> <200209300703.DAA07152@smc.vnet.net> <anbngd$e4p$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

I have developed one package where it is included a functions for
solving System of ODE. You can downloaded from:
http://web.usal.es/~guillerm/biokmod.
The functions are: SystemDSolve and SystemNDSolve 
Guillermo Sanchez

"Hermann Schmitt" <schmitther at netcologne.de> wrote in message news:<anbngd$e4p$1 at smc.vnet.net>...
> Hello,
> I want to add a further suggestion:
> Probably each differential equation logically belongs to one of the defined
> classes in the sense, that it helps to define the behaviour of the
> component.
> In this case, each differential equation should be stored in one of theses
> classes as textstring in a form appropriate for the execution in
> Mathematica.
> Hermann Schmitt
> ----- Original Message -----
> From: "Hermann Schmitt" <schmitther at netcologne.de>
To: mathgroup at smc.vnet.net
> Subject: [mg36919]  Request for Mathematica Programming help.
> 
> 
> > Hello,
> >
> > I agree with Mr. Kuska, that the system Mr Nagesh describes is not
> > userfriendly. But I think, the suggestions of Mr. Kuska do not make it
>  more
> > userfriendly, rather the opposite is true.
> >
> > Mr. Nagesh asks
> >
> > "Is any body here have expertise or information about the capability of
> > Mathematica as a system simulation tool?"
> > Mr. Kuska answers:
> > "Since the most "system simulation tools" are simply solving a system of
> > ordinary differntial equations it is simple to do this with NDSolve[]."
> >
> > My comment:
> >
> > That is: He sees the simulation system merely as a set of differential
> > equations.
> >
> > The question of Mr. Nagesh:
> >
> > "My 4th Objective:- How can I program the check for correctness of the
> >  input values supplied by the package user ?"
> > The answer of Mr. Kuska is:
> > "And @@ (NumericQ /@  {aListOfAllYourNumericParameters})"
> >
> > My comment:
> >
> > This is a nice command and shows the knowledge of Mr.Kuska. But does Mr.
> > Nagesh understand it and  is it sufficient to check, if all inputs are
> > numerical?
> >
> > Additionally I think, it is not userfriendly to see the input merely as a
> > set of 200-250 numbers.
> >
> >
> >
> > My suggestion is, that JLink is used, a suggestion Mr. Kusk takes into
> > consideration, too.
> >
> > But further I suggest, that classes are defined in Java, which represent
>  the
> > parts of the system.
> >
> > Constructors of the classes should build objects with default values.
> > Graphical user interfaces
> >
> > should give the opportunity to change the data fields in the objects and
> > check the input for correctness.
> >
> > The system should give the opportunity, to store the objects on harddisk
> > (serialization).
> >
> > accessed directly.
> >
> > > Hi,
> > >
> > >
> > >
> > > > My name is Nagesh and pursuing research studies in Refrigeration. At
> > > > present I am writing a Dynamic Refrigeration System Simulation
>  Package.
>  I
> > > > am using Mathematica as a programming language for the same since last
>  one
> > > > year. I don't have any programming experience before this. I have
>  following
> > > > querries:-
> > > > 1. Is any body here have expertise or information about the capability
>  of
> > > > Mathematica as a system simulation tool?
> > >
> > > Since the most "system simulation tools" are simply solving a system of
> > > ordinary differntial equations it is simple to do this with NDSolve[].
> > >
> > > > 2. Is is possible to program a user friendly interface for my system
> > > > simulation package with Mathematica or I have to use some other
>  software?
> > >
> > > Write a MathLink or J/Link frontend that launch the kernel. But you
> > > should keep
> > > in mind that the user interface is typical 80-90 % of your code.
> > > If you just whant to solve some ode's it is probably easyer to
> > > include one of the excelent ode-solvers from netlib in your C-code
> > > than to call Mathematica to do that. As long as you dont wish to change
> > > the ode's very often (than Mathematica is more flexible) you should
> > > not use Mathematica.
> > >
> > > > 3. My refrigeration system simulation package is likely to have
> > > > approximately 60 First order Differential equations. Is is possible to
> > > > solve these in Mathematica ?
> > >
> > > Sure.
> > > > If yes then can anybody here guide me about
> > > > this further.
> > >
> > > Write down the equations and call NDSolve[].
> > >
> > > >
> > > > I am explaining below in short about the objectives I want to fulfill
>  from
> > > > coding out of my main input file
> > > >
> > > > 1. Example from Main Input File ( this will contain about 200-250
>  variables
> > > > which will be entered by the user of this package)
> > >
> > > This sounds like a *very* userfiendly interface ;-)
> > >
> > > >
> > > > Below is examples of two variables entered into this file, which will
>  be
> > > > used in other analysis files for further evaluation.
> > > >
> > > > 2. Example from other analysis file ( there will be about 20-25 other
>  such
> > > > component analysis files ) where the above mentioned variables from
>  main
> > > > input file will be used for further evaluations:-
> > > >
> > > > Below is one example from this file explaining how the variables from
>  main
> > > > input file will be used in other files.
> > > >
> > > > I hope that this short information will be useful for guiding me to
>  solve
> > > > the following problems that I am facing. I am facing follwing problems
>  or
> > > > objectives:-
> > > >
> > > > 1. My 1st Objective:- The user of this package must be able to change
>  only
> > > > the value of the variable in the main input file but he must not be
>  able
>  to
> > > > change the name of the variable itself. For example he must be able to
> > > > change the value of the variable "  " but he must not be able to
>  change
>  the
> > > > name of this variable itself.
> > > > Here our problem is how to achieve or program it so that our objective
>  will
> > > > be fullfilled.
> > >
> > > Options with defaulf values ? or something like
> > >
> > > {aParam,bParam}={ODEParameter1,ODEParameter2} /.
> > >                        userRules /.
> > >                        {ODEParameter1->1,ODEParameter2->2}
> > >
> > > >
> > > > 2. My 2nd Objective:- How I can program the main input file so that it
>  will
> > > > be user friendly in terms of its visuals and satisfying the constraint
> > > > mentioned above in objective1.
> > >
> > > What is *userfiendly* in a file with 250 variables ???
> > >
> > > >
> > > > 3. My 3rd Objective:- How can I program the optional values for each
> > > > variable in the main input file ? so that there will be always a value
> > > > assigned to each variable listed in main input file whenever the user
>  opens
> > > > up this file. If user want to change the values of some variables then
>  he
> > > > can change them and run the simulation otherwise the simulation run
>  will
>  be
> > > > done with optional values assigned to each variable in the input file.
> > >
> > > See above.
> > >
> > > >
> > > > 4. My 4th Objective:- How can I program the check for correctness of
>  the
> > > > input values supplied by the package user ?
> > >
> > > And @@ (NumericQ /@  {aListOfAllYourNumericParameters})
> > > >
> > >
> > > Regards
> > >   Jens
> > >
> >
> >


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