
MultiplyDivide |
ptolemy.actor.lib.MultiplyDivide |
A polymorphic multiplier and/or divider. This adder has two input
ports, both of which are multiports, and one output port, which is
not. The types on the ports are undeclared and will be resolved by
the type resolution mechanism. Data that arrives on the input port
named multiply will be multiplied, and data that arrives on
the input port named divide will be divided. Any token type
supporting multiplication and division can be used. In most
domains, either input port can be left unconnected. Thus, to get a
simple multiplier (with no division), just leave the divide
input unconnected.
Currently, the type system is quite liberal about the resolved
types it will permit at the inputs. In particular, it may permit
the multiply and divide inputs to resolve to types
that cannot in fact be multiplied or divided. In these cases, a
run-time error will occur. In the future, we hope that the type
system will intercept such errors before run time.
This actor does not require that each input channel have a token
upon firing. It will multiply or divide available tokens at the
inputs and ignore the channels that do not have tokens. It
consumes at most one input token from each port. If no input
tokens are available on the multiply inputs, then a
numerator of one is assumed for the division operations. The "one"
is obtained by calling the one() method of the first token seen at
the divide input. If no input tokens are available at all,
then no output is produced.
Author(s): Edward A. Lee
Version:$Id: MultiplyDivide.java,v 1.35 2005/10/28 19:20:13 cxh Exp $
Pt.Proposed Rating:Green (eal)
Pt.Accepted Rating:Green (bilung)
divide
Input for tokens to be divided. This is a multiport, and its
type is inferred from the connections.
output
Output port. The type is inferred from the connections.
multiply
Input for tokens to be multiplied. This is a multiport, and its
type is inferred from the connections.