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 (171kb) downloaded 4 time(s).

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

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.

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?

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.

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 (47kb) downloaded 14 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!

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 (108kb) downloaded 11 time(s).

Edited by user 30 November 2020 03:31:10(UTC)  | Reason: Not specified

Euler is still good.