Stability analysis

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Deepa

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Jun 16, 2022, 10:17:08 AMJun 16
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Dear All,

After running the steady-state analysis for my model, I find the
the following information in Results > Stability tab.


KINETIC STABILITY ANALYSIS

The linear stability analysis based on the eigenvalues

of the Jacobian matrix is only valid for steady states.


Summary:

This state 's stability is undetermined.


Eigenvalue statistics:

Largest real part: 0

Largest absolute imaginary part: 0

0 are purely real

0 are purely imaginary

0 are complex

0 are equal to zero

0 have positive real part

0 have negative real part

stiffness = 0.00000

time hierarchy = 0.00000


Fold bifurcaton test functions (standard, bifurcation discovery tool): 0.00000, 0.00000

Hopf bifurcaton test functions (standard, bifurcation discovery tool): 0.00000, 0.00000

Oscillation indicator: 0.00000


I'm not sure if "This state 's stability is undetermined." means there is an issue with the model. 

Could someone please explain this a bit?

I would be happy to share the model if someone can please have a look.

Thanks a lot,

Deepa



Hoops, Stefan (sh9cq)

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Jun 16, 2022, 8:19:29 PMJun 16
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Hello Deepa,

It seems that you do not have a steady-state thus the analysis you see
is invalid as state in the first sentence.

Thanks,
Stefan
--
Stefan Hoops, Ph.D.
Research Associate Professor
Biocomplexity Institute & Initiative
University of Virginia
995 Research Park Boulevard
Charlottesville, VA 22911

Phone: +1 540 570 1301
Email: sho...@virginia.edu

Deepa

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Jun 16, 2022, 8:55:47 PMJun 16
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Hello Stefan,

In the first tab, it is given  A steady-state with given resolution was found (kindly see the snapshot below).
I was thinking the concentrations reported here are the steady-state concentrations. But I'm not sure
if this is the correct steady-state since the stability analysis shows the state is invalid.


image.png


I'll share the model privately. Could you please have a look?
I'm not sure if there are other issues that I should look into.

Thanks so much for your time and attention,
Deepa

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Hoops, Stefan (sh9cq)

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Jun 16, 2022, 9:56:22 PMJun 16
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Hello Deepa,

To see the stability analysis you need to turn it on in the steady
state task by checking the appropriate box.

Stefan


On Fri, 2022-06-17 at 06:25 +0530, Deepa wrote:
> Hello Stefan,
>
> In the first tab, it is given  A steady-state with given resolution
> was found (kindly see the snapshot below).
> I was thinking the concentrations reported here are the steady-state
> concentrations. But I'm not sure
> if this is the correct steady-state since the stability analysis
> shows the state is invalid.
>
>

Deepa

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Jun 16, 2022, 10:21:47 PMJun 16
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Thanks a lot, my mistake :)



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