# startstop.py ---
#
# Filename: startstop.py
# Description:
# Author:Subhasis Ray
# Maintainer:
# Created: Sun Jul 1 13:42:28 2012 (+0530)
# Version:
# Last-Updated: Sun Jul 1 14:41:34 2012 (+0530)
# By: subha
# Update #: 62
# URL:
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# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3, or
# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
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# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street, Fifth
# Floor, Boston, MA 02110-1301, USA.
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import pylab
import moose
[docs]def main():
"""
This demo shows how to start, stop, and continue a simulation.
This is commonly done when we want to run a model till settling, then
change a parameter or deliver a stimulus, and then continue the
simulation.
Here, the model is just the output of a PulseGen object which
generates periodic pulses.
The demo shows how to start the simulation. using the
*moose.reinit* command to reset the model to its initial state,
and *moose.start* command to run the model for the specified duration.
We issue multiple *moose.start* commands and do different things to
the model between them. First, we change the delay of the pulseGen.
Then we show a number of ways to assign the timestep (dt) to the
table object in the simulation.
Note that throughout this simulation the pulsegen is going at a
uniform rate, it is just being sampled by the output table at
different intervals.
"""
dt = 0.1
steps = 100
simtime = dt * steps
# Pulsegen is on tick 0, we can pre-emptively set its dt.
moose.setClock(0, dt)
table = setup_model()
pulse = moose.element( '/model/pulse' )
# The 'tick' field is on every object, we can use this to set its dt.
moose.setClock( table.tick, dt )
moose.reinit()
clock = moose.element('/clock')
print(dt)
print(('dt = ', dt, ', Total simulation time = ', simtime))
print(('Running simulation for', simtime, 'seconds'))
moose.start( simtime )
print(('Simulator time:', clock.currentTime))
# Here we change the pulse delay and then run again.
pulse.delay[0] = 1.0
moose.start( simtime )
# We change the table tick and use a different dt for it:
table.tick = 2
moose.setClock( table.tick, dt * 2 )
moose.start( simtime )
# Here is yet another way to change clocks used by the table
moose.useClock( 9, '/model/pulse/tab', 'process' )
print((table.tick))
moose.setClock( 9, dt / 2.0 )
moose.start( simtime )
# Finally, here we change the pulse delay to 1 second and run again.
print(('Simulator time at end of simulation', clock.currentTime))
pylab.plot(pylab.linspace(0, clock.currentTime, len(table.vector)), table.vector)
pylab.show()
def setup_model():
model_container = moose.Neutral('/model')
pulse = moose.PulseGen('/model/pulse')
pulse.level[0] = 1.0
pulse.delay[0] = 0.5
pulse.width[0] = 0.5
table = moose.Table('%s/tab' % (pulse.path))
moose.connect(table, 'requestOut', pulse, 'getOutputValue')
return table
if __name__ == '__main__':
main()