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4.3.14 String The String library consists of actors that operate on strings. Actor Libraries StringCompare (extends TypedAtomicActor): Compute a specified string comparison function on the two string inputs. The function is specified by the function attribute, where valid functions are equals, startsWith, endsWith, and contains. StringFunction (extends Transformer): Apply a specified function on the input string and send the result to the output. The function is specified by the function attribute, where valid functions are toLowerCase, toUpperCase, and trim. StringIndexOf (extends TypedAtomicActor): Output the index of a string (searchFor) contained in another string (inText). StringLength (extends Transformer): Output the length of an input string. StringMatches (extends TypedAtomicActor): Output true if matchString matches pattern, false otherwise. StringReplace (extends TypedAtomicActor): Replace a substring of stringToEdit that matches pattern by replacement. If replaceAll is true, then all matching substrings are replaced. StringSubstring (extends Transformer): Output a substring of the input string, from the start index to stop. 4.3.15 Domain Specific Several sublibraries contain actors that are primarily useful only with corresponding directors. Continuous Time The continuous-time library contains a set of actors designed specifically for use in the CT domain. ContinuousClock: Generate a piecewise-constant signal with instantaneous transitions between levels. TriggeredContinuousClock: Generate a piecewise-constant signal with instantaneous transitions between levels, where two input ports are provided to start and stop the clock. ContinuousSinewave: Generate a continuous-time sinusoidal signal. CTCompositeActor: Composite actor to use when a continuous-time model is created within a continuous-time model. Continuous Time: Dynamics The actors in this sublibrary have continuous-time dynamics (i.e., they involve integrators, and hence must coordinate with the differential equation solver). 146 Ptolemy <strong>II</strong>
Actor Libraries Integrator: Integrate the input signal over time to produce the output signal. That is, the input is the derivative of the output with respect to time. This actor can be used to close feedback loops in CT to define interesting differential equation systems. LaplaceTransferFunction: Filter the input with the specified rational Laplace transform transfer function. Note that this actor constructs a submodel, so it might be interesting to look inside the actor after it is initialized. LinearStateSpace: Filter the input with a linear system. Note that this actor constructs a submodel, so it might be interesting to look inside the actor after it is initialized. DifferentialSystem: Filter the input with the specified system, which can nonlinear, and is specified using the expression language. Note that this actor constructs a submodel, so it might be interesting to look inside the actor after it is initialized. RateLimiter: Limit the first derivative of the input signal, so that the output changes no faster than the specified limit. Continuous Time: To Discrete The actors in this sublibrary produce discrete event signals, which are signals that only have values at discrete points in time. EventSource: Output a set of events at discrete set of time points. LevelCrossingDetector: A event detector that converts continuous signals to discrete events when the continuous signal crosses a level threshold. PeriodicSampler: Sample the input signal with the specified rate, producing discrete output events. TriggeredSampler: Sample the input signal at times where the trigger input has a discrete input events. ThresholdMonitor: Output true if the input value is in the interval [a, b], which is centered at thresholdCenter and has width thresholdWidth. This actor controls the integration step size so that the input does not cross the threshold without producing at least one true output. ZeroCrossingDetector: When the trigger is zero (within the specified errorTolerance), then output the value from the input port as a discrete event. This actor controls the integration step size to accurately resolve the time at which the zero crossing occurs. Continuous Time: To Continuous The actors in this sublibrary convert discrete event signals into continuous-time signals. FirstOrderHold: Convert discrete events at the input to a continuous-time signal at the output by projecting the value with the derivative. ZeroOrderHold: Convert discrete events at the input to a continuous-time signal at the output by holding the value of the discrete event until the next discrete event arrives. Heterogeneous Concurrent Modeling and Design 147
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PTOLEMY II HETEROGENEOUS CONCURRENT
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VOLUME 1 INTRODUCTION TO PTOLEMY II
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Volume 1 Contents Introduction to P
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2.10.3. Constructing Modal Models 8
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7. MoML 191 7.1. Introduction 191 7
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1 Introduction Author: Edward A. Le
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Introduction heterochronous dataflo
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Introduction A major emphasis in Pt
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Introduction determine when actors
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Introduction provides levels of vis
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Introduction is a guard, and the se
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Introduction well. All of these are
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Introduction clients to update thei
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Introduction will be supplied with
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Introduction 1.3.12 Synchronous Dat
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Introduction FIGURE 1.10. Refinemen
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Introduction occlusions due to terr
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Introduction tion. The overall arch
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Introduction kernel.attributes This
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Introduction 1.5.2 Overview of Key
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Introduction Actor interfaces are k
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Heterogeneous Concurrent Modeling a
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Introduction actor actor.gui data.e
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Introduction cient, scalable, and u
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Introduction 1.5.8 Future Capabilit
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Introduction Appendix A: UML — Un
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Introduction grams, the only constr
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2 Using Vergil Authors: Edward A. L
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Using Vergil 2.2.2 Executing a Pre-
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Using Vergil The Lorenz attractor m
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Using Vergil The Continuous-Time (C
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Using Vergil box in figure 2.11. En
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Using Vergil Don’t panic! Excepti
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Using Vergil tions are a normal par
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Using Vergil 2.4 Hierarchy Ptolemy
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Using Vergil Then using these ports
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Using Vergil the default 0.1 to 0.0
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Using Vergil pan window, it is easy
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Using Vergil FIGURE 2.33. The pan w
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Using Vergil we have modified the c
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Using Vergil model, simply copy (or
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Using Vergil A key issue is to deci
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Using Vergil instances. This proble
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Using Vergil quick tour for more de
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Using Vergil uses the index in the
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Using Vergil AddSubtract actor, and
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Using Vergil If you look inside the
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Using Vergil If you look inside the
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Using Vergil transition (or right c
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Using Vergil Once you have created
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Using Vergil The grid is turned off
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Authors: Edward A. Lee Xiaojun Liu
Page 105 and 106: Expressions classes to create a gen
Page 107 and 108: Expressions The % operation is a mo
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Page 111 and 112: Expressions 3.3.5 State Machines Ex
Page 113 and 114: Expressions whose value is an array
Page 115 and 116: Expressions from it. For instance,
Page 117 and 118: Expressions defined. For example, >
Page 119 and 120: Expressions length is given by the
Page 121 and 122: Expressions Thus, for example, you
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Page 125 and 126: Expressions value. For example, fix
Page 127 and 128: Expressions In the example in figur
Page 129 and 130: Expressions A.2 Basic Mathematical
Page 131 and 132: Expressions A.3 Matrix, Array, and
Page 133 and 134: Expressions A.5 Signal Processing F
Page 135 and 136: Expressions TABLE 8: Functions perf
Page 137 and 138: 4 Actor Libraries Authors: Elaine C
Page 139 and 140: Actor Libraries properly in the CT
Page 141 and 142: Actor Libraries ing that multiple c
Page 143 and 144: Actor Libraries TypedAtomicActor «
Page 145 and 146: Actor Libraries SequenceScope (exte
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Page 149 and 150: Actor Libraries MobileFunction (ext
Page 151 and 152: Actor Libraries LogicFunction (exte
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Page 161 and 162: 5 Designing Actors Authors: Christo
Page 163 and 164: Designing Actors /** Javadoc commen
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Page 167 and 168: Designing Actors import ptolemy.act
Page 169 and 170: Designing Actors makes such actors
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Page 173 and 174: Designing Actors morphic actor comp
Page 175 and 176: Designing Actors To get data polymo
Page 177 and 178: Designing Actors public class Seque
Page 179 and 180: Designing Actors be used in domains
Page 181 and 182: Designing Actors alComm actor. Beca
Page 183 and 184: Designing Actors attribute has valu
Page 185 and 186: Designing Actors import ptolemy.act
Page 187 and 188: 6 Coding Style Authors: Christopher
Page 189 and 190: Coding Style /* One line descriptio
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Page 201 and 202: Authors: Edward A. Lee Steve Neuend
Page 203 and 204: MoML cutes it forever, until you hi
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MoML
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MoML 7.3.3 Names and Classes Most M
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MoML Here, the element named
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MoML implement. 7.3.7 Doc Element S
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MoML It is also sometimes necess
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MoML then there will be a link t
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MoML found. For example, if the cla
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MoML it cannot collide with the nam
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MoML The rendering of the icon is d
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MoML 7.4.5 Deleting Entities, Relat
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MoML This unlinks a port from the s
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MoML model. The EntityLibrary class
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MoML Suppose that using incremental
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MoML Generate a sine wave.
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MoML
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MoML Number of iterations in
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MoML -P- The f
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MoML -P- The phase,
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8 Custom Applets Authors: Edward A.
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Custom Applets html code, see the J
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Custom Applets public class Tutoria
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Custom Applets then the result of
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Custom Applets 8.3.5 Using Model Pa
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Custom Applets ptolemy/domains/doma
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References [1] G. Agha, Actors: A M
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[33] S. A. Edwards, “The Specific
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[67] E. Kohler, The Click Modular R
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[95] J. Liu, X. Liu, T. J. Koo, B.
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[132]W. R. Sutherland, "The on-Line
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Glossary abstract syntax ..........
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Ptolemy II ........................
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Index Symbols - in UML 41 # in UML
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coin flips 142 Color class 173 colo
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entity in XML 198 EntityLibrary cla
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Director class 159 inverse FFT 124
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CompositeEntity class 206 nextPower
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safety 34 SampleDelay actor 78, 138
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type constraint 155 type constraint
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