Source code for sbmlsim.model.model_change

"""Model changes.

Model changes are structural changes to the model structure.
Changes of values and initial conditions are encoded via
the changes instead.
import roadrunner
from sbmlutils import log

[docs]logger = log.get_logger(__name__)
[docs]class ModelChange(object): """ModelChange. Structural change to a model. """
[docs] CLAMP_SPECIES = "clamp_species"
[docs] def clamp_species(r: roadrunner.RoadRunner, species_id, formula=True, speed=1e4): """Clamp/free species to certain value or formula. This is only an approximative clamp, i.e. not working instantenious. Depending on the model kinetics different speed settings are required. FIXME: `time` cannot be used in formula due to FIXME: concentrations and amounts are not handled (uses native species setting i.e., amount or concentration definition. """ if formula is None: # unclamping species. formula = False if formula is True: # clamping to current model value formula = r[species_id] selections = r.timeCourseSelections rid = f"{species_id}_clamp" if formula: r.addReaction(rid, [], [species_id], f"{speed}*({formula}-{species_id})") # update selections selections.append(rid) r.selections = selections else: r.removeReaction(rid) # update selections r.selections = [key for key in selections if key != rid]