def __init__(self):
ptype = self.getPType()
# Explicit initialisation of all particle variables
for v in ptype.variables:
if isinstance(v.initial, attrgetter):
initial = v.initial(self)
elif isinstance(v.initial, Field):
lon = self.getInitialValue(ptype, name='lon')
lat = self.getInitialValue(ptype, name='lat')
depth = self.getInitialValue(ptype, name='depth')
time = self.getInitialValue(ptype, name='time')
v.initial.fieldset.computeTimeChunk(time, 1)
if time is None:
logger.error(
'Cannot initialise a Variable with a Field if no time provided. '
'Add a "time=" to ParticleSet construction')
exit(-1)
initial = v.initial[time, lon, lat, depth]
else:
initial = v.initial
# Enforce type of initial value
if v.dtype != c_void_p:
setattr(self, v.name, v.dtype(initial))
# Placeholder for explicit error handling
self.exception = None
def write(self, pset, time, sync=True):
"""Write :class:`parcels.particleset.ParticleSet` data to file
:param pset: ParticleSet object to write
:param time: Time at which to write ParticleSet
:param sync: Optional argument whether to write data to disk immediately. Default is True
"""
if isinstance(time, delta):
time = time.total_seconds()
if self.lasttime_written != time: # only write if 'time' hasn't been written yet
self.lasttime_written = time
if self.type is 'array':
# Check if largest particle ID is smaller than the last ID in ParticleFile.
# Otherwise, new particles have been added and netcdf will fail
if pset.size > 0:
if max([p.id for p in pset]) > self.id[-1]:
logger.error(
"Number of particles appears to increase. Use type='indexed' for ParticleFile"
)
# Finds the indices (inds) of the particle IDs in the ParticleFile,
# because particles can have been deleted
pids = [p.id for p in pset]
inds = np.in1d(self.id[:], pids, assume_unique=True)
inds = np.arange(len(self.id[:]))[inds]
self.time[inds, self.idx] = time
self.lat[inds, self.idx] = np.array([p.lat for p in pset])
self.lon[inds, self.idx] = np.array([p.lon for p in pset])
self.z[inds, self.idx] = np.array([p.depth for p in pset])
for var in self.user_vars:
getattr(self, var)[inds, self.idx] = np.array(
[getattr(p, var) for p in pset])
else:
logger.warning("ParticleSet is empty on writing as array")
self.idx += 1
elif self.type is 'indexed':
ind = np.arange(pset.size) + self.idx
self.id[ind] = np.array([p.id for p in pset])
self.time[ind] = time
self.lat[ind] = np.array([p.lat for p in pset])
self.lon[ind] = np.array([p.lon for p in pset])
self.z[ind] = np.array([p.depth for p in pset])
for var in self.user_vars:
getattr(self, var)[ind] = np.array(
[getattr(p, var) for p in pset])
self.idx += pset.size
if sync:
self.sync()