Hi Dan,
Try ::
See kepler/ptolemy/src/doc/expressionsa3.htm
Below is the LaTeX.
_Christopher
In the context of Ptolemy II models, the variables in scope include
all parameters defined at the same level of the hierarchy or
higher. So for example, if an actor has a parameter named ``\expr{x}''
with
value \expr{1.0}, then another parameter of the same actor can have an
expression with value ``\expr{PI*x/2.0}'', which will evaluate to $\pi$/2.
Consider a parameter \parameter{P} in actor \actorName{X} which is in
turn contained by
composite actor \actorName{Y}. The scope of an expression for
\parameter{P} includes all the
parameters contained by \actorName{X} and \actorName{Y}, plus those of
the container of \actorName{Y}, its
container, etc. That is, the scope includes any parameters defined
above in the hierarchy.
You can \index{parameters, adding} add parameters to actors (composite
or not) by right clicking on the actor, selecting
\submenu{Customize}{Configure} and then clicking on
``\expr{Add},'' or by dragging in a parameter from the \library{Utilities}
library. Thus, you can add variables to any scope, a capability that
serves the same role as the \index{let} ``let'' construct in many
functional programming languages.
Occasionally, it is desirable to access parameters that are not in
scope. The expression language supports a limited syntax that permits
access to certain variables out of scope. In particular, if in place
of a variable name \expr{x} in an expression you write \expr{A::x},
then instead of looking for \expr{x} in scope, the interpreter looks
for a container named \expr{A} in the scope and a parameter named
\expr{x} in \expr{A}. This allows reaching down one level in the
hierarchy from either the current container or any of its containers.
On 10/12/12 4:23 PM, Daniel Crawl wrote:
Hi Christopher,
Is it possible to reference a Parameter contained within another
Parameter? For example, if Parameter x contains Parameter y, I
expect to access y using x.y with a Const or Expression actor, but
this does not work. What do you suggest?
Thanks,
--dan
--
Christopher Brooks, PMP University of California
CHESS Executive Director US Mail: 337 Cory Hall
Programmer/Analyst CHESS/Ptolemy/Trust Berkeley, CA 94720-1774
ph: 510.643.9841 (Office: 545Q Cory)
home: (F-Tu) 707.665.0131 cell: 707.332.0670
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