Hi Jonathan,
Ptolemy has a Python actor that uses Jython
http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIfaq.htm#Scripting says:
*5.9 Is there a scripting interface to Ptolemy II ?*
The PythonScript actor includes and interface to Jython
<http://www.jython.org/#in_browser>, a Java implementation of
Python. The PythonScript actor allows the user to define an actor
on the fly by defining the |fire()| and other methods in Python.
Using an interpreted language in this context instead of defining
actors in Java means that we need not recompile and restart
Ptolemy II to make a change to an actor. The tradeoff is that a
PythonScript actor will run more slowly than a similar actor
implemented in Java.
For details, see
|http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIlatest/ptII/doc/codeDoc/ptolemy/actor/lib/python/PythonScript.html|
The Ptolemy II test suite uses Jacl, a Java implementation of Tcl
as a scripting language. With Jacl, we can build and run models
using an interpreted scripting environment without compilation and
avoiding the usual edit/compile/run loop.
For details, see the Testing link in
|http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIlatest/ptII/doc/coding/|
<http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIlatest/ptII/doc/coding/index.htm>
I'm not that up on how Jython accesses Java objects, but in theory one
could write an actor that gets the container object, then finds a
parameter and then calls setExpression o the parameter. This could
happen at runtime. However, this is difficult to get right. The
SetVariable actor does something similar and it is not an easy actor to
write. A Jython-based actor that set parameter values in the container
would need to be very similar to SetVariable. See
http://ptolemy.eecs.berkeley.edu/ptolemyII/ptII8.0/ptII/doc/codeDoc/ptolemy/actor/lib/SetVariable.html
If you are trying to do a parameter sweep, then
http://ptolemy.eecs.berkeley.edu/ptolemyII/ptIIfaq.htm#parameterSweeps says:
*4.11 How do a do a parameter sweep?*
A Parameter Sweep is when a model is run a number of times with
different parameters to perhaps find an optimal solution. For
details, see
http://chess.eecs.berkeley.edu/ptexternal/wiki/Main/ParameterSweeps
<http://chess.eecs.berkeley.edu/ptexternal/wiki/Main/ParameterSweeps#in_browser>.
Another idea is to have Jython set the parameters and then run the
model. We do similar things using Tcl in the test case. See
ptolemy/moml/test/MoMLParser.tcl
This test from ptolemy/actor/lib/test/Test.xml loads a .xml file and runs it
test Test-3.0 {Test case where training and we get no data} {
# Thomas Mandl pointed out this bug and supplied a fix
set workspace [java::new ptolemy.kernel.util.Workspace "Test3_0"]
set parser [java::new ptolemy.moml.MoMLParser $workspace]
$parser reset
$parser purgeAllModelRecords
$parser setMoMLFilters [java::null]
$parser addMoMLFilters \
[java::call ptolemy.moml.filter.BackwardCompatibility
allFilters]
$parser addMoMLFilter [java::new \
ptolemy.moml.filter.RemoveGraphicalClasses]
#set model3_0 \
# [java::cast ptolemy.actor.TypedCompositeActor [$parser
parseFile BooleanSwitch\
_RegressionTest.xml]]
set model3_0 \
[java::cast ptolemy.actor.TypedCompositeActor [$parser
parseFile BooleanSwitch\
_RegressionTest_WrongTrainingValues.xml]]
set manager [java::new ptolemy.actor.Manager $workspace
"test3_0Manager"]
$model3_0 setManager $manager
$manager execute
# Get the corrrectValues parameter, which should be {}
set test2 [$model3_0 getEntity Test2]
set correctValues [java::cast ptolemy.data.expr.Parameter [$test2
getAttribute corr\
ectValues]]
list [$correctValues getExpression]
} {{{}}}
Later in that file we get the Test2 entity
set test2 [$model3_0 getEntity Test2]
and the get the "correctValues" parameter
set correctValues [java::cast ptolemy.data.expr.Parameter [$test2
getAttribute correctValues]]
To get the value of the correctValues parameter, call "$correctValues
getExpression".
To set the value
$correctValues setExpression "{1,2}"
It is probably possible to do something similar in Jython, where you
instantiate the model by calling the parser set the variables and run
it. You could use the Recorder actor to get the outputs of the model,
or write the data using ExpressionWriter or LineWriter.
_Christopher
On 10/21/13 10:51 AM, Jonathan Boright wrote:
Hi All,
I'm wondering if there is a way to set workflow parameters using
python code? I see the ParameterSet actor, but I'd like to set
parameters dynamically using python instead of using a static text
file...
Thanks for your help.
Jon
---------------------------------
Jonathan Boright
Research Scientist
ISciences, LLC
61 Main Street, Suite 200
Burlington, VT 05401
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Academic Program Manager & Software Engineer US Mail: 337 Cory Hall
CHESS/iCyPhy/Ptolemy/TerraSwarm Berkeley, CA 94720-1774
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