SMath

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Yes, it's something that I found accidentally. The statement ft(F(s)) appear as a function, but it's a matrix!

Oscar

#4 Pubblicato: 30/05/2012 15:18:43

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Hello,

I tried to open it using the latest SMath.
I get an error message in the last FOR loop: "Function not defined"

Thanks,
Basile

#5 Pubblicato: 30/05/2012 15:53:17

Andrey Ivashov

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[USERLINK]Basile[/USERLINK], you need to define a function to work with as shown in the first message.

Wrote

Regards.

#6 Pubblicato: 31/05/2012 21:25:59

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Thank you Andrey,

Basile

#7 Pubblicato: 31/05/2012 21:28:48

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Oscar,

Which Numerical Inverse Laplace Transform do you use?
Any reference?

Thank you,
Basile

#8 Pubblicato: 01/06/2012 09:24:33

135 apprezzamenti in 309 post.

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Hi Basile,
The method is based on work of J. Valsa and L. Brancik: Approximate Formulae for Numerical Inversion of Laplace Transforms, Int. Journal of Numerical Modelling: Electronic Networks, Devices and Fields, Vol. 11, (1998), pp. 153-166

Regards,

Oscar

1 utenti hanno apprezzato questo post

Davide Carpi 01/06/2012 09:32:00

#9 Pubblicato: 01/06/2012 17:29:58

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Oscar,

Thank you,

Basile

#10 Pubblicato: 04/06/2012 19:47:33

135 apprezzamenti in 309 post.

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Bode Diagram Revisited.
This is a function for graphing the Bode plot of a system. Please plot the magnitude and phase on a diferent graph each one, deactivate "grid" and "axis" for a better visualization of logarithmic grid.

Download it here: MyBode3.sm (30,31 KiB) scaricato 1337 volta(e).

#11 Pubblicato: 05/06/2012 15:02:37

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Root Locus Snippet

This is a snippet for plotting Root Locus of a sistem. The input is the denominator of coefficients of transfer function:

Download it here

Oscar

#12 Pubblicato: 25/08/2017 13:22:41

Leandro de Oliveira

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The file seems to be locked, I can't put a equation.

#13 Pubblicato: 25/08/2017 17:02:19

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.. here is the Bode Plot.

Bode plot.sm (27,47 KiB) scaricato 1505 volta(e).

2 utenti hanno apprezzato questo post

Viktor 15/11/2017 19:30:00, Oscar Campo 27/08/2017 03:21:00

#14 Pubblicato: 25/08/2017 18:44:35

Davide Carpi

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Wrote
The file seems to be locked, I can't put a equation.

Open the file in SMath Studio and then go to File > Properties > File Attributes and uncheck Read-only. This attribute is required when the worksheet is designed to be a snippet.

If you like my plugins please consider to support the program buying a license; for personal contributions to me: paypal.me/dcprojects

#15 Pubblicato: 26/08/2017 09:01:49

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Wrote
Hi, this is a snippet for numerical inverse Laplace transform. You can find time response of a system expressed in F(s) form. enjoy

=================
This 5 years old document does not work 6179.
Here is the Maple companion.

#16 Pubblicato: 27/08/2017 10:46:55

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Wrote

=================
This 5 years old document does not work 6179.

Only a very little detail to fix this 5 years old document: declare F(s) and change the last line on snippet:

ft( "F(s" ) = augment(t,ft)

for

ft() = augment(t,ft)

You can download the updated version from here

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Davide Carpi 28/08/2017 13:28:00

#17 Pubblicato: 28/08/2017 11:01:53

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Wrote
You can download the updated version from here

... that's only several pages long of HTML code.
No work sheet. Best is to upload WS in the forum.
For "Laplace stuff", better use maple(,) as show above.

Cheers, Jean

#18 Pubblicato: 28/08/2017 11:32:53

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Wrote

... that's only several pages long of HTML code.
No work sheet. Best is to upload WS in the forum.

Use "save as"

Citazione

For "Laplace stuff", better use maple(,) as show above.

Yes, and also it’s possible use f(t)=Maxima(ilt(F(s),s,t)) but it’s interesting show how you can implement inverse Laplace of a function in SMath.
P.D. The symbolic form of f(t) obtained from ilt() it’s more “elegant” than maple version

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Davide Carpi 28/08/2017 13:28:00

#19 Pubblicato: 28/08/2017 13:04:34