Re: problem regarding writing the value into a text file using open modelica

[Adrian Pop]

Hi,

Learn a bit more about Modelica
on initial and when equations.

You need to use when equations if you want functions to be
called only at certain time (use when sample() then ...).

If you don't use when equations then the solver can
call your function at any time during integration which
is something you do not want for functions reading and
writing to files.

Cheers,
Adrian Pop/

Roshna wrote:

Hi Adrian,

In this file I tried to write one read and write function using
externalfunctions. I put one value(say 50)in READ1.txt and my aim is to read
that value by the externalfunction and to write the same value in another
text file OUTFILE.txt. I am getting one value, but it is -1.923905.What is
happening here?
If I want to feed model input data externally, how to set/control the time?


-----Original Message-----
From: owner-openmodelicainter...@ida.liu.se
[mailto:owner-openmodelicainter...@ida.liu.se] On Behalf Of Adrian Pop
Sent: Saturday, October 10, 2009 8:26 PM
To: openmodelicainterest@ida.liu.se
Cc: nilanc...@cdactvm.in
Subject: Re: problem regarding writing the value into a text file using open
modelica


Hi Roshna,

You need to open the file in append
mode and don't rewind the file.
See the attached .zip.

ad...@kafka ~/dev/OpenModelicaMathCore/build/bin/Roshna
$ ../omc external.mos
1.000000
1.000000
1.000000
true
0
0
0
record SimulationResult
     resultFile = "ExternalLibraries_res.plt"
end SimulationResult;
0

Cheers,
Adrian Pop/

Roshna wrote:

Hai all,

I want to write the value of one variable into a external text file using external function interface while running the .mo file. So I tried to modify the example program, which is given in users guide to get the value printed.(please see the attachment).I am not getting any errors, but the value is not getting printed even a single time. I did the following way.

loadFile("C:/OpenModelica1.5.0/tmp/ExternalLibraries.mo")

true

*>>* system("gcc -c -o libExternalFunc1_ext.o ExternalFunc1.c");

*>>* system("gcc -c -o libExternalFunc2.a ExternalFunc2.c");

*>>* simulate(ExternalLibraries)

record SimulationResult

resultFile = "ExternalLibraries_res.plt"

end SimulationResult;

*>>* plot({x,y})

true

Can anybody help me?

Thanks n Regards,

Roshna C P

Control & Instrumentation Group,

Centre for Development of Advanced Computing,

Trivandrum, India.

--
_____________________________________________________________________
Adrian Pop                      | PhD
Open Source Modelica Consortium | Technical Coordinator Department of
Computer Science  | http://www.ida.liu.se/~adrpo
Linköping University            | phone:+46 76 2343499/+46 13 285781
S-581 83 Linköping, Sweden      | fax:  +46 13 142231
OSMC & LiU/IDA/PELAB            | office: 3B:478