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 Posted: 5/30/2012 3:18:43 PM

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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 Posted: 5/30/2012 3:53:17 PM

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 Posted: 5/31/2012 9:25:59 PM

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Thank you Andrey,

Basile

#7 Posted: 5/31/2012 9:28:48 PM

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Oscar,

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

Thank you,
Basile

#8 Posted: 6/1/2012 9:24:33 AM

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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

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Davide Carpi 6/1/2012 9:32:00 AM

#9 Posted: 6/1/2012 5:29:58 PM

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Oscar,

Thank you,

Basile

#10 Posted: 6/4/2012 7:47:33 PM

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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 KiB) downloaded 61 time(s).

#11 Posted: 6/5/2012 3:02:37 PM

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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 Posted: 8/25/2017 1:22:41 PM

Leandro de Oliveira

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

#13 Posted: 8/25/2017 5:02:19 PM

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.. here is the Bode Plot.

Bode plot.sm (27 KiB) downloaded 213 time(s).

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Viktor 11/15/2017 7:30:00 PM, Oscar Campo 8/27/2017 3:21:00 AM

#14 Posted: 8/25/2017 6:44:35 PM

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 Posted: 8/26/2017 9:01:49 AM

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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 Posted: 8/27/2017 10:46:55 AM

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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 8/28/2017 1:28:00 PM

#17 Posted: 8/28/2017 11:01:53 AM

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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 Posted: 8/28/2017 11:32:53 AM

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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"

Quote

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 8/28/2017 1:28:00 PM

#19 Posted: 8/28/2017 1:04:34 PM