def createTable(name, directory, schema, title=None,
separate_branches=False, branch_name="default"):
"""Create a new table.
A new table is implemented in a Root file by a Root tree (a
'TTree' instance).
'name' -- The name under which to store the tree.
'directory' -- The Root 'Directory' in which to store the tree.
'schema' -- The table schema.
'title' -- The tree's title. If 'None', the name is used.
'separate_branches' -- If true, the leaf corresponding to each
column is places on a separate branch with the same name as the
column. Otherwise, all leaves are combined into a single
branch, named by 'branch_name'.
'branch_name' -- If 'separate_branches' is false, this is the
name of the branch containing all the leaves.
'with_metdata' -- Load and store metadata.
"""
# Make sure the table is being put in a Root directory.
if not isinstance(directory, Directory):
raise TypeError, "directory is not in a Root file"
# Make sure the directory is writable.
if not directory.writable:
raise hep.fs.AccessError, "%s is not writable" % directory
# Clean up arguments.
if title is None:
# No title specified; use the tree name.
title = name
# Make sure 'separate_branches' is boolean.
separate_branches = bool(separate_branches)
# Build the tree.
address = _getSwigPointerAddress(
directory._Directory__tdirectory.this)
tree = ext.createTree(
address, name, title, schema, separate_branches, branch_name,
8192, directory.file.with_metadata)
# Note the file on the tree, so that the file isn't closed until
# the tree has gone away.
tree.file = directory.file
return tree
def loadPdtFile(path):
"""Load particle data from a PDT table file.
'path' -- The path to a PDT table file (typically named "pdt.table"
or similar.
returns -- A 'Table' instance containing the particle data."""
# Start with a blank table.
table = Table()
# Process each line in the file.
for line in open(path):
if line.startswith("end"):
# Stop processing at the "end" line.
break
if line.strip() == "":
# Empty line; skip it.
continue
if line.startswith("*"):
# Comment line; skip it.
continue
# Break the line into parts at whitespace.
parts = line.split()
# The first part tells what kind of line this is.
command = parts[0]
if command == "add":
if parts[1] == "p":
# Add a new particle
table.add(Particle(
type=parts[2],
name=parts[3],
id=int(parts[4]),
mass=float(parts[5]),
width=float(parts[6]),
max_Dm=float(parts[7]),
charge=int(parts[8]) / 3.,
spin=int(parts[9]) / 2.,
range=float(parts[10]) * 0.001,
is_stable=False,
))
else:
_warning("add of unknown object '%s'" % parts[1])
elif command == "sets":
if parts[1] == "p":
# Set an attribute of an existing particle.
name = parts[2]
try:
particle = table[name]
except KeyError:
_warning("no such particle '%s' in sets" % name)
else:
if parts[3] == "isStable":
setattr(particle, "is_stable",
bool(int(parts[4])))
else:
setattr(particle, parts[3],
_sloppyConvertString(parts[4]))
else:
_warning("sets of unknown object '%s'" % parts[1])
else:
_warning("unknown command '%s'" % command)
for particle in table.values():
id = particle.id
try:
particle.charge_conjugate = table.findId(-id)
except:
particle.charge_conjugate = particle
return table
