[Scilab-users] Problems with "To workspace" and "From workspace"

[Michael Ungelehrt]

Hello Paul,

 

thank you for your answer.

I had a look at the “DOLLAR” block. It’s a kind of delay block, but it’s not
the right block for the task I have to do, I think.

I attached a simulation file, which shows the problem. This is not the real
simulation, because the real one is more complex.

 

First of all I load the .sce file. If I start the simulation, the output
shows the result with the initial value of C defined in the .sce file and I
get the error message “Evaluation problem: value not updated from context.
Protected variable name. Please choose another variable name.”

After I start the simulation a second time, the output graph shows the
correct result and the error message doesn’t appear again.

 

Is there any possibility to write into my variable C at the beginning of the
simulation? Or is it possible to do this task with the “DOLLAR” block like
you thought?

 

Best regards,

Michael

 

Von: Paul Bignier [mailto:paul.bignier at scilab-enterprises.com] 
Gesendet: Donnerstag, 10. April 2014 12:35
An: International users mailing list for Scilab.; martin.buecherl at th-deg.de
Betreff: Re: [Scilab-users] Problems with "To workspace" and "From
workspace"

 


Hi Michael,

Indeed it looks like you can't overwrite a variable defined in the context.
Have you tried replacing the "FROMWSB" block with a "DOLLAR" block?
Then it would have the same data and activation inputs as the "TOWS_c"
block,
and you would not need to pre-define 'C' (just give it an initial value in
the block parameters).

Hope this helps,
Regards,
Paul



On 04/10/2014 09:27 AM, Michael Ungelehrt wrote:

Dear users,

 

I have a problem with the “To workspace” respectively “From workspace” block
in Xcos.

 

I’d like to write the value of a function to workspace if the value of
another function changes its sign from + to -. A short time later I’d like
to use this value in a third function and retrieve it from workspace.

 

For that I evaluate the first function with the “NEGTOPOS_f” block and give
the output event to the “TOWS_c” block. The “TOWS_c” block is connected with
the second function and should write the value to a vaiable A in the
workspace.

The “FROMWSB” block is connected with a third function which should use the
variable that is saved before.

 

Now I have the following problem:

If I start the simulation, the “FROMWSB” says that the variable A does not
exist. So my idea was to define the variable in the variable-browser before
I start the simulation. If I do so I get an error at the “TOWS_c” block:
“Evaluation problem: value not updated from context. Protected variable
name. Please choose another variable name.”

 

Is there any solution for that problem?

 

Block parameters:

>From workspace:

Variable name:                C

Interpolation Method:                 0

Enable zero crossing:     1

Output at end:                 1

 

To workspace:

Size of buffer:                  1

Scilab variable name:     C

Inherit:                                0

 

Definition of variable C in SciNotes upfront:

C.time=0;

C.values=0;        

 

Thank you in advance!

 

 

Mit freundlichen Grüßen

Best regards,

 

Michael Ungelehrt

 

 

Logo_TC_Cham

 

Michael Ungelehrt, B.Eng.

Laboringenieur

 

THD – Technische Hochschule Deggendorf
Technologie Campus Cham

Badstraße 21

D-93413 Cham

 

Tel: +49 9971 99673-29

Fax: +49 9971 99673-69

E-Mail: michael.ungelehrt at th-deg.de

Web: www.tc-cham.th-deg.de <http://www.tc-cham.th-deg.de/> 

 






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Paul BIGNIER
Development engineer
-----------------------------------------------------------
Scilab Enterprises
143bis rue Yves Le Coz - 78000 Versailles, France
Phone: +33.1.80.77.04.69
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