Cantera with Matlab - Error Using ctmethods

[Marjinal Çapulcu]

Hello all,

I'm trying to using Cantera on Matlab. But i am getting these following errors. It would be nice anyone help me on this topic.

I am using Matlab R2019a - Python 2.7 - Cantera 2.4

Referance installation : https://cantera.org/install/windows-install.html

Error is;

>> Yanma_Matlab

Error using ctmethods

***********************************************************************

CanteraError thrown by Phase::setMoleFractionsByName:

Unknown species 'C02'

***********************************************************************

Error in phase_set (line 5)

    ctmethods(30, n, -job, a);

Error in ThermoPhase/setMoleFractions (line 42)

    phase_set(tp.tp_id, 30, x);

Error in ThermoPhase/set (line 99)

            setMoleFractions(tp, val);

Error in Yanma_Matlab (line 7)

    set(gas,'Temperature',T1,'P',oneatm,'X',['C02:',num2str(1),',H20:',num2str(2),...

 

>> 

I'm attaching m file and screenshot of the error. 

Thank you very much.

Ps: I am an amateur on Matlab and coding something else. I'm trying to use Cantera tool on Matlab to obtain flue gases mechnaical properties like density, viscosity etc.

[Bryan W. Weber]

Hi,

You have colons in your species names in the set line, delete those colons and that should fix it. In other words, turn 'CO2:' into 'CO2'.

Best,

Bryan

[Steven DeCaluwe]

Hi Marjinal,

Welcome to Cantera! I was in a similar position when I first started using Cantera (no coding experience, trying to get things running on Matlab). 

The error here is that you have a typo in your species name: you are writing C02 (“C-zero-two’), when it should be CO2 (“C-letter o-two”). 

This is in the line:

set(gas,'Temperature',T1,'P',oneatm,'X',['C02:',num2str(1),',H20:',num2str(2),...

It looks like you have a similar error in H20 vs H2O, and perhaps elsewhere. 

Hope this helps!  Also, a request for the future: please do not attach or insert screenshots. These cannot be searched by people looking for help on similar error messages, and also cannot be read by the screen-readers commonly used by people with visual impairments. 

Best of luck!

Steven

Sent from my iPhone

On Nov 11, 2019, at 6:19 AM, Marjinal Çapulcu <zelfore...@gmail.com> wrote:



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<Yanma_Matlab.m>

<matlab-cantera-error.PNG>

[Steven DeCaluwe]

Bryan, I think those colons are for specifying the composition string, and are necessary.  I.e:

 

‘CO2:1,H2O:2,…”

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[Marjinal Çapulcu]

Dear Bryan & Steven,

First of all thank you so much for your interest. I've done things that you suggested me. So, i got another error like;

>> Yanma_Matlab_ForumREV

Error using ctmethods

***********************************************************************

CanteraError thrown by Phase::setMoleFractionsByName:

Unknown species 'CO21,H2O2,O2'

***********************************************************************

Error in phase_set (line 5)

    ctmethods(30, n, -job, a);

Error in ThermoPhase/setMoleFractions (line 42)

    phase_set(tp.tp_id, 30, x);

Error in ThermoPhase/set (line 99)

            setMoleFractions(tp, val);

Error in Yanma_Matlab_ForumREV (line 7)

    set(gas,'Temperature',T1,'P',oneatm,'X',['CO2',num2str(1),',H2O',num2str(2),...

 

>> 

What should i do? Again, thank you so much. I am attaching new m file after these updates (ends with REV).

Best,

Guven

[Marjinal Çapulcu]

Hello again,

Now i've tried correcting Typos only, not colons. And interesting, it worked. Now, i am attaching the last m file which is working.

Thank you so much for your interest guys.

Its really exciting to talking with you guys. 

And sorry for my easy mistakes. As i said, i am beginner. Thank you for your patient.

Best,

Güven

Special thanks to Steven.

[Bryan W. Weber]

Thanks Steven! I misread how the code was working.

Güven, I'm glad your code is working now, thanks for sharing it back with us!

Best,

Bryan

[Furkan Yildirim]

Hello everyone my name is Furkan Enes,

I am also a new user of Cantera. This was a very old forum but I want to ask something about the error that appears on Matlab.

Mister Guven said the fact that the error was solved. Although I directly use the last Matlab code, it gives an error that says error using ctmedhods. The whole error statements are below.

Error using ctmethods

***********************************************************************
CanteraError thrown by Phase::setMoleFractionsByName:

Unknown species 'CO21,H2O2,O2'

***********************************************************************


Error in phase_set (line 5)
    ctmethods(30, n, -job, a);

Error in ThermoPhase/setMoleFractions (line 42)
    phase_set(tp.tp_id, 30, x);

Error in ThermoPhase/set (line 99)
            setMoleFractions(tp, val);

Error in Yanma_Matlab_ForumREV (line 7)
    set(gas,'Temperature',T1,'P',oneatm,'X',['CO2',num2str(1),',H2O',num2str(2),...

I am thanking you in advance. I will be so glad if someone helps me.

11 Kasım 2019 Pazartesi tarihinde saat 19:00:40 UTC+3 itibarıyla bryan....@gmail.com şunları yazdı:

[Bryan Weber]

Hi,

As Steven mentioned further up, you need colons between the species name and the number to specify the mole fractions.

Best,

Bryan