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... up to You the expert !
Cheers ... Jean

Prova modello permeabilita.sm (129 KiB) downloaded 35 time(s).

yap, there is something in the data that screwup the ro2 and rco2 evaluation

Damned fruits, things whit dead things are much more simple

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yap, there is something in the data that screwup the ro2 and rco2 evaluation

Do you mean you have red ?
Quite right about dead fruits.
Here in Québec, the most poisoned strawberries ... 0 poisoned blueberries.
The most idiotic are kiwis from New Zealand, they grow in Québec smaller size, succulent.

I was reading the paper Adams-Moulton, to some casual exception, they are all
same ballistic approximation ... dn_GearsBDF runs 5 to 10 times faster.
From the attached, please report if you have red evaluation.
If so, it would indicate a bug in your latest SS version.
At the first eventual red occurrence, please attach an *.PDF to see the guilty.

See you soon ... Jean

Prova modello permeabilita.sm (170 KiB) downloaded 27 time(s).

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From the attached, please report if you have red evaluation.
If so, it would indicate a bug in your latest SS version.

No, Jean, do not mislead the man. If something doesn't work, it doesn't mean there is an error. There are alternative probabilities.

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No, Jean, do not mislead the man.
If something doesn't work, it doesn't mean there is an error.
There are alternative probabilities.

I presumed my document didn't work as given.
Let's see what does not evaluate.
Cheers Viacheslav ... Jean

Yup, isn't a problem of code, is a problem of data.

Now I'm trying to make something different for having an idea of the behaviors.

Basically, I would like to evaluate the two respiration rate at different concentrations, 0%, 5%, 10%, 15% and 20%, so to be able to leave it constant in the ODE splitting the curve into 3 portions.



In any case, there is something in this model that I haven't understand for sure.

Ok, after a little bit of scavenging to find the right data, seems that the implementation of uni works quite well!

I have really to thank you a lot for your help, and also I need to understand better how to use gearsbdf and in general all the things that you has write there!

Now I will add other things and reupload the file.

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Yup, isn't a problem of code, is a problem of data.
Now I'm trying to make something different for having an idea of the behaviors.
Basically, I would like to evaluate the two respiration rate at different concentrations,
0%, 5%, 10%, 15% and 20% ...
so to be able to leave it constant in the ODE splitting the curve into 3 portions.
In any case, there is something in this model that I haven't understood for sure.

As given, your system depends upon 9 parameters, of which many may be interactive.
In Mathcad/Mathsoft, we can optimize a DE wrt some parameters of the DE.
Up to 4 parameters is no sweat. See image in the attached document.
This is due to the Mathsoft proprietary bloc Given/Minerr, not known possible in Smath.
On the other hand, in Smath, given a data set, we can attempt to fit a model function.
Just to fit a model, the data set need not be clean. Do you have experimental data ?
In Mathcad, you can set the ODEsolve as a function, if that is possible our friend
Viacheslav will surely reply. On my side, will cogitate.
Cheers ... Jean

ODE Aminohippuric MCD.sm (164 KiB) downloaded 26 time(s).

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Yup, isn't a problem of code, is a problem of data.
Now I'm trying to make something different for having an idea of the behaviors.
Basically, I would like to evaluate the two respiration rate at different concentrations,
0%, 5%, 10%, 15% and 20% ...
so to be able to leave it constant in the ODE splitting the curve into 3 portions.
In any case, there is something in this model that I haven't understood for sure.

As given, your system depends upon 9 parameters, of which many may be interactive.
In Mathcad/Mathsoft, we can optimize a DE wrt some parameters of the DE.
Up to 4 parameters is no sweat. See image in the attached document.
This is due to the Mathsoft proprietary bloc Given/Minerr, not known possible in Smath.
On the other hand, in Smath, given a data set, we can attempt to fit a model function.
Just to fit a model, the data set need not be clean. Do you have experimental data ?
In Mathcad, you can set the ODEsolve as a function, if that is possible our friend
Viacheslav will surely reply. On my side, will cogitate.
Cheers ... Jean

ODE Aminohippuric MCD.sm (164 KiB) downloaded 26 time(s).

This is a really interesting material and I thank you a lot for have share it!

I really need to become more familiar with the software.

In your opinion the book SMath for Physics by Bernard V Liengme is a good investment of time and money?

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In your opinion the book SMath for Physics by Bernard V Liengme is a good investment of time and money?

Sorry, I'm not familiar with the book, just aware of it.
Hopefully, Smath Community will advise ... I guess yes.
If not exactly wrt your project, otherwise sure educative.
Cheers ... Jean

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In your opinion the book SMath for Physics by Bernard V Liengme is a good investment of time and money?

Sorry, I'm not familiar with the book, just aware of it.
Hopefully, Smath Community will advise ... I guess yes.
If not exactly wrt your project, otherwise sure educative.
Cheers ... Jean

eheh We will see, for his price I suppose that I can take the risk.

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eheh We will see, for his price I suppose that I can take the risk.

I would recommend just looking at the video courses that are currently available:

- Simple Introduction in SMath with Tanya J. Laird;
- Curso SMath Studio CEI;
- Curso de SMath;
- Marcelo Ortiz Plá.

SMath Suite: A Primer (pdf)
SMath Suite: A Primer (documents)

SMath Suite. A Primer (Bernard Liengme).pdf (2 MiB) downloaded 40 time(s).

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eheh We will see, for his price I suppose that I can take the risk.

Very minimalist for new Smath user, not familiar with CAS software.
You will find infinitely more stuff/project in Samples Repository.

Thank you again for all your goods advice.

I had always used an Hp50g, paper, and pen but now I really need to make this step up.

So, I will study well the video and the materials on the forum.

Ok, I started to understand a little bit better how smath work and I really hope it will be able to do what I need because I really like it.

Now, sorry for bothering you again, I would like to have another little help.

To have the model properly working I need to add some other pieces, and I made some tentative to put these pieces is with some uhmmm "horrible" results.

Now, If you can give me feedback on what I have done on pages 2-3 would be lovely

I would like to understand if what I have done is totally wrong or if there are some "grammatical" errors.

So any Help is welcome!




Modeling respiration-transpiration FRA2.sm (46 KiB) downloaded 35 time(s).

1. Forget AbsTol, RelTol ... there is no known use, specific to dn_GearsBDF
2. mr.pr not defined
3. Construct the DE piece wise
What you have is so far not same as the previous work
The original *.PDF is so much jargon ... their DE is what you should use.
I can't follow your D(t,oco).

Prova modello permeabilita.sm (158 KiB) downloaded 30 time(s).

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1. Forget AbsTol, RelTol ... there is no known use, specific to dn_GearsBDF
2. mr.pr not defined
3. Construct the DE piece wise
What you have is so far not same as the previous work
The original *.PDF is so much jargon ... their DE is what you should use.
I can't follow your D(t,oco).

Prova modello permeabilita.sm (158 KiB) downloaded 30 time(s).

Thank's a lot for all the observations!

I thought to had to define m.pr in the stack XD my bad

Now I try to rewrite all in a more clear and comprehensible way, maybe with some comment!

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Now I try to rewrite all in a more clear and comprehensible way, maybe with some comment!

... the DE system from the paper. Originally, you composed two DE.
That paper is damned hard to follow, probably a plagia itself.

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Now I try to rewrite all in a more clear and comprehensible way, maybe with some comment!

... the DE system from the paper. Originally, you composed two DE.
That paper is damned hard to follow, probably a plagia itself.

Yes, in reality, that two DE was just a first step.

What I need to do is just a little bit more complex than what is written in the first paper, because there are a lot of things that have an influence on the mass transfer in a package.

So, what I'm trying to do is to add a piece at once.

Now, in the last file there are in oco 5 pieces.

[O.2i (oxygen in the package),
C.O2i (CO2 in the package),
m.pr (amount of water that permeate through the plastic film),
W.1 (weight loss of product due to the loss of water),
HR1 (humidity in the package]

Now, unfortunately, all these factors are correlated...and more are needed for describing all the system.

I'm trying to write in a very simple way what I would like to do on the smath file, and I hope it will be possible.


Honest, more I look at the sheet and more it seems a mess to me.

I need to find a way to make it more simple

Presentation1.pdf (107 KiB) downloaded 31 time(s).

It is possible to solve the system in this way, i.e. integrating each equation separately. But here you need to be very careful.

Modeling respiration-transpiration in a modified atmosphere packaging system containing blueberry 2 (uni).pdf (83 KiB) downloaded 31 time(s).
Modeling respiration-transpiration in a modified atmosphere packaging system containing blueberry 2 (uni).sm (18 KiB) downloaded 33 time(s).

Euler is still good.