Simulation progression

pyproject.toml

@@ -9,10 +9,12 @@ description = "A Bondgraph and block scheme simulator"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
+    "DyMat>=0.7,<1",
     "matplotlib>=3.8,<4",
     "msgpack>=1.0,<2",
     "OMPython>=3.6,<5",
     "PySide6>=6.7,<7",
+    "scipy>=1.12,<2",
 ]
 
 [project.scripts]

src/bedit_gui/controllers/simulation_run_controller.py

@@ -25,6 +25,7 @@ class SimulationRunController(QObject):
     run_cancelled = Signal()
     run_failed = Signal(object)
     run_progress = Signal(int)
+    segment_completed = Signal()
     simulation_state_changed = Signal()
 
     def __init__(self, window: SimulationWindow, files: SimulationFileController, session_factory: SessionFactory = _create_session) -> None:
@@ -45,6 +46,7 @@ class SimulationRunController(QObject):
         self.run_cancelled.connect(self._cancelled)
         self.run_failed.connect(self._failed)
         self.run_progress.connect(self.window.ui.progressBar.setValue)
+        self.segment_completed.connect(self._segment_completed)
         self._load_session()
 
     @property
@@ -98,7 +100,7 @@ class SimulationRunController(QObject):
             self.run_completed.emit(result)
 
     async def _run_with_progress(self, session: SimulationSession) -> SimulationResult:
-        task = asyncio.create_task(session.run_next())
+        task = asyncio.create_task(session.run_next_segmented(lambda _result: self.segment_completed.emit()))
         last_progress = -1
         while not task.done():
             progress = min(session.get_progress(), 99)
@@ -108,6 +110,12 @@ class SimulationRunController(QObject):
             await asyncio.sleep(0.1)
         return await task
 
+    def _segment_completed(self) -> None:
+        self._store_session_state()
+        if self.session is not None:
+            self.window.statusBar().showMessage(f"Simulation running · current time {self.session.current_end_time}")
+            logger.debug("Simulation segment completed at time %s", self.session.current_end_time)
+
     def _completed(self, result: SimulationResult) -> None:
         self._running = False
         self._store_session_state()

src/bedit_simulation/__init__.py

@@ -6,7 +6,7 @@ from .openmodelica import (
     ProcessResult,
     SimulationCancelledError,
 )
-from .results import SimulationResult, load_openmodelica_csv
+from .results import SimulationResult, load_openmodelica_csv, load_openmodelica_mat
 from .compile import compile_component, compile_component_sync
 from .simulation import (
     ModelBuildResult,
@@ -38,5 +38,6 @@ __all__ = [
     "compile_component",
     "compile_component_sync",
     "load_openmodelica_csv",
+    "load_openmodelica_mat",
     "simulate",
 ]

src/bedit_simulation/results.py

@@ -44,3 +44,25 @@ def load_openmodelica_csv(path: str | Path) -> dict[str, list[float]]:
     except StopIteration as error:
         raise ValueError("simulation result CSV is empty") from error
     return columns
+
+
+def load_openmodelica_mat(path: str | Path) -> dict[str, list[float]]:
+    """Load the MATLAB v4 result layout written by OpenModelica."""
+    try:
+        from DyMat import DyMatFile
+    except ImportError:
+        raise ValueError("reading OpenModelica MAT results requires DyMat") from None
+    try:
+        result = DyMatFile(str(Path(path)))
+        blocks = result.blocks()
+        time_block = 2 if 2 in blocks else blocks[-1]
+        times = result.abscissa(time_block, valuesOnly=True).astype(float).tolist()
+        columns = {"time": times}
+        for name in result.names():
+            values = result.data(name).astype(float).tolist()
+            if len(values) != len(times):
+                values = [values[0]] * len(times)
+            columns[name] = values
+    except (IndexError, KeyError, OSError, TypeError, ValueError) as error:
+        raise ValueError(f"could not read OpenModelica MAT results: {error}") from error
+    return columns

src/bedit_simulation/runtime.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import math
-from collections.abc import Sequence
+from collections.abc import Callable, Sequence
 from dataclasses import dataclass
 from pathlib import Path
 
@@ -9,6 +9,8 @@ from .openmodelica import OpenModelicaRunner
 from .results import SimulationResult
 from .simulation import Simulation, SimulationOptions, SimulationStateError
 
+_SEGMENTS_PER_RUN = 10
+
 
 @dataclass(frozen=True)
 class SimulationRunSettings:
@@ -40,26 +42,70 @@ class SimulationSession:
         self.results = list(results)
         self._simulation = Simulation(runner)
         self._simulation.load_compiled(model_name, executable)
+        self._segments_completed = 0
+        self._segments_total = 1
 
     @property
     def is_running(self) -> bool:
         return self._simulation.is_running
 
     def get_progress(self) -> int:
-        return self._simulation.get_progress()
+        return min(100, int((self._segments_completed + self._simulation.get_progress() / 100) * 100 / self._segments_total))
 
     async def run_next(self) -> SimulationResult:
-        start_time = self.settings.start_time
-        stop_time = self.current_end_time + self.settings.duration
-        run_duration = stop_time - start_time
-        intervals = math.ceil(run_duration / self.settings.step_size) if self.settings.use_timed_steps else math.ceil(self.settings.number_of_steps * run_duration / self.settings.duration)
-        options = SimulationOptions(start_time=start_time, stop_time=stop_time, number_of_intervals=intervals, tolerance=self.settings.tolerance, method=self.settings.method)
-        result = await self._simulation.run(options)
-        # TODO: Continue from OpenModelica restart state instead of recomputing the full time range.
-        self.current_end_time = stop_time
-        self.results[:] = [result]
+        return await self.run_next_segmented()
+
+    async def run_next_segmented(self, segment_completed: Callable[[SimulationResult], None] | None = None) -> SimulationResult:
+        """Advance one configured duration in restartable, plot-ready segments."""
+        previous_file = self._restart_file()
+        if previous_file is None and self.current_end_time != self.settings.start_time:
+            self.current_end_time = self.settings.start_time
+            self.results.clear()
+        run_start_time = self.current_end_time
+        run_stop_time = run_start_time + self.settings.duration
+        segment_duration = self.settings.duration / _SEGMENTS_PER_RUN
+        intervals = self._segment_intervals(segment_duration)
+        self._segments_completed = 0
+        self._segments_total = _SEGMENTS_PER_RUN
+        result: SimulationResult | None = None
+        for segment in range(_SEGMENTS_PER_RUN):
+            start_time = self.current_end_time
+            stop_time = run_stop_time if segment == _SEGMENTS_PER_RUN - 1 else run_start_time + (segment + 1) * segment_duration
+            result_file = self._simulation.last_build.executable.parent / f"{self._simulation.last_build.executable.stem}_segment_{len(self.results):06d}.mat"
+            options = SimulationOptions(
+                start_time=start_time,
+                stop_time=stop_time,
+                number_of_intervals=intervals,
+                tolerance=self.settings.tolerance,
+                method=self.settings.method,
+                result_file=result_file,
+                initialization_file=previous_file,
+                initialization_time=start_time if previous_file is not None else None,
+                skip_initialization=previous_file is not None,
+            )
+            result = await self._simulation.run(options)
+            self.current_end_time = stop_time
+            self.results.append(result)
+            previous_file = result.result_file
+            self._segments_completed += 1
+            if segment_completed is not None:
+                segment_completed(result)
+        assert result is not None
+        self._segments_total = 1
+        self._segments_completed = 1
         return result
 
+    def _segment_intervals(self, segment_duration: float) -> int:
+        if self.settings.use_timed_steps:
+            return max(1, math.ceil(segment_duration / self.settings.step_size))
+        return max(1, math.ceil(self.settings.number_of_steps / _SEGMENTS_PER_RUN))
+
+    def _restart_file(self) -> Path | None:
+        for result in reversed(self.results):
+            if result.result_file is not None and result.result_file.is_file():
+                return result.result_file
+        return None
+
     def cancel(self) -> bool:
         return self._simulation.cancel()
 
@@ -68,3 +114,5 @@ class SimulationSession:
             raise SimulationStateError("cannot reset while a simulation is running")
         self.current_end_time = self.settings.start_time
         self.results.clear()
+        self._segments_completed = 0
+        self._segments_total = 1

src/bedit_simulation/simulation.py

@@ -22,7 +22,7 @@ from .openmodelica import (
     ProcessResult,
     _run_on_worker,
 )
-from .results import SimulationResult, load_openmodelica_csv
+from .results import SimulationResult, load_openmodelica_csv, load_openmodelica_mat
 
 _MODEL_FILE = "model.mo"
 _RUN_SCRIPT_FILE = "run.mos"
@@ -39,6 +39,10 @@ class SimulationOptions:
     number_of_intervals: int = 500
     tolerance: float = 1e-6
     method: str | None = None
+    result_file: str | Path | None = None
+    initialization_file: str | Path | None = None
+    initialization_time: float | None = None
+    skip_initialization: bool = False
 
     def __post_init__(self) -> None:
         if self.stop_time <= self.start_time:
@@ -473,7 +477,7 @@ class Simulation:
         options: SimulationOptions,
         directory: Path,
     ) -> SimulationResult:
-        result_path = directory / f"{executable.stem}_res.csv"
+        result_path = Path(options.result_file) if options.result_file is not None else directory / f"{executable.stem}_res.csv"
         process = self._run_executable(executable, options, directory)
         if not result_path.is_file():
             details = process.stderr.strip() or process.stdout.strip()
@@ -491,7 +495,7 @@ class Simulation:
         )
         return SimulationResult(
             model_name=model_name,
-            data=load_openmodelica_csv(result_path),
+            data=load_openmodelica_mat(result_path) if result_path.suffix.lower() == ".mat" else load_openmodelica_csv(result_path),
             process_output=process.stdout,
             process_errors=process.stderr,
             result_file=result_path,
@@ -529,10 +533,18 @@ class Simulation:
             f"-stopTime={options.stop_time}",
             f"-stepSize={step_size}",
             f"-tolerance={options.tolerance}",
-            "-outputFormat=csv",
+            f"-outputFormat={'mat' if options.result_file is not None and Path(options.result_file).suffix.lower() == '.mat' else 'csv'}",
             f"-port={port}",
             "-logFormat=xmltcp",
         ]
+        if options.result_file is not None:
+            arguments.extend([f"-r={Path(options.result_file).resolve()}", "-emit_protected", "-ignoreHideResult"])
+        if options.initialization_file is not None:
+            arguments.append(f"-iif={Path(options.initialization_file).resolve()}")
+        if options.initialization_time is not None:
+            arguments.append(f"-iit={options.initialization_time}")
+        if options.skip_initialization:
+            arguments.append("-iim=none")
         if options.method:
             arguments.append(f"-s={options.method}")
         script_path = directory / _RUN_SCRIPT_FILE

untitled.bedit.json

@@ -2049,7 +2049,7 @@
           "name": "run bondgraph",
           "start_time": 0.0,
           "duration": 10.0,
-          "use_timed_steps": true,
+          "use_timed_steps": false,
           "number_of_steps": 500,
           "step_size": 0.001,
           "method": "dassl",