Adding Data to the Trajectory

Download: example_15_more_ways_to_add_data.py

Here are the different ways to add data to your Trajectory container:

__author__ = 'Robert Meyer'

from pypet import Trajectory, Result, Parameter


traj = Trajectory()

# There are more ways to add data,
# 1st the standard way:
traj.f_add_parameter('x', 1, comment='I am the first dimension!')
# 2nd by providing a new parameter/result instance, be aware that the data is added where
# you specify it. There are no such things as shortcuts for parameter creation:
traj.parameters.y = Parameter('y', 1, comment='I am the second dimension!')
# 3rd as before, but if our new leaf has NO name it will be renamed accordingly:
traj.parameters.t = Parameter('', 1, comment='Third dimension')
# See:
print('t=' + str(traj.t))

# What happens if our new parameter's name does not match the name passed to the constructor?
traj.parameters.subgroup = Parameter('v', 2, comment='Fourth dimension')
# Well, since 'subgroup' != 'v', 'subgroup' becomes just another group node created on the fly
print(traj.parameters.subgroup)
# This even works for already existing groups and with the well known *dot* notation:
traj.parameters = Parameter('subgroup.subsubgroup.w', 2)
# See
print('w='+str(traj.par.subgroup.subsubgroup.w))


# There's a lazy version which does not require a constructor.
# This can be turned on via
traj.v_lazy_adding = True
# And you can add a new parameter via
traj.parameters.u = 1, 'Fourth dimension'
print('u=' + str(traj.u))
# However, now you can no longer change values of existing parameters,
# because this is interpreted as a new parameter addition, so this fails:
try:
    traj.parameters.u = 2
    print('I won`t be reached')
except AttributeError as exc:
    print('Told you: `%s`' % repr(exc))
# See:
print('u=' + str(traj.par.u))

# But disabling the new adding method makes this work again
traj.v_lazy_adding = False
traj.f_get('u').f_unlock()
traj.parameters.u = 3
# now we simply change `u` to be 3

# There's also a lazy version to add new group nodes:
from pypet import new_group
traj.v_lazy_adding=True
traj.im_new = new_group
# And `im_new` is a new group node:
print(traj.im_new)


# Finally, there's one more thing. Using this notation we can also add links.
# Simply use the `=` assignment with objects that already exist in your trajectory:
traj.mylink = traj.f_get('x')
# now `mylink` links to parameter `x`, also fast access works:
print('Linking to x gives: ' + str(traj.mylink))