Tour of What's New in Version 6.0-alpha
See also What's new in Version 5.1.
Contents:
- A Token can now be "nil", which means that the data is missing.
If Token.nil() is
called, it indicates that a token is a nil or missing token, which contains no data.
Nil or missing tokens are common in analytical systems like R and SAS
where they are used to handle sparsely populated data sources.
In database parlance, missing tokens are sometimes called
null tokens. Since null is a Java keyword, we use the term "nil".
The PN Remove Nil Tokens
demo illustrates use of nil tokens.
A number of new and enhanced actor libraries are included in version 6.1
You may also wish to refer to the
ptolemy.actor.lib
package, where most of the domain-polymorphic actors reside (domain-polymorphic actors are
those that can be used in more than one domain).
New generic actors:
- Java compatibility:
Ptolemy II can be compiled under Java 1.5.0_01. Java 1.4.2_08
is preferred though.