/usr/bin/lhapdf-query is in python-lhapdf 5.9.1-4.
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import os, sys, cmd, logging
from math import sqrt, log, exp
usage = """Query the LHAPDF library
Usage: %prog <cmd> <setname/num> <memnum> x Q [<flavourID>]
Retrieve PDF values from LHAPDF, given a set name, member number
and values for x and Q. This will return a list of xf(x,Q2) values
for each parton; specifying a parton name on the command line will
return the single appropriate xf(x,Q2) value for that flavour.
TODO:
* clarify this documentation
* allow pattern matching on listsets
* use friendly names for flavours
"""
## Init LHAPDF
import lhapdf
try:
lhapdf.setVerbosity(lhapdf.SILENT)
except:
sys.stderr.write("Error when initialising LHAPDF")
sys.exit(1)
def getPDFSetId(name):
try:
if ":" in name:
pdffile = str(name.split(":")[0])
pdfmember = int(name.split(":")[1])
else:
info = lhapdf.getPDFSetInfo(int(name))
pdffile = info.file
pdfmember = info.memberId
return pdffile, pdfmember
except:
sys.stderr.write("Error in parsing PDF set ID: %s\n" % name)
sys.exit(1)
def getPDFVals(lhafn, name, x, Q):
PDFNAME, PDFNSET = getPDFSetId(name)
try:
lhapdf.initPDFSet(PDFNAME, PDFNSET)
vals = lhafn(float(x), float(Q))
return vals
except:
sys.stderr.write("Error when querying set %s:%d\n" % (PDFNAME, PDFNSET))
sys.exit(1)
def printPDFVals(vals, flav=None):
if flav is None:
for val in vals:
print val,
print
else:
print vals[flav]
## Internal command parser
class LHAPDFCmd(cmd.Cmd):
"""Process commands that query the LHAPDF library."""
intro = "Query the LHAPDF parton density collection"
prompt = "lhapdf> "
def _plotPDFFn(self, pdffn, argstr):
try:
import pylab as mpl
_args = argstr.split(' ')
name = _args[0]
flav = int(_args[1])
#
PDFNAME, PDFNSET = getPDFSetId(name)
lhapdf.initPDFSet(PDFNAME, PDFNSET)
x_range = (lhapdf.getXmin(1), lhapdf.getXmax(1))
Q_range = (sqrt(lhapdf.getQ2min(1)), sqrt(lhapdf.getQ2max(1)))
Qs = []
N = 4
for i in range(N+1):
logQDiff = log(Q_range[1]) - log(Q_range[0])
logQ = log(Q_range[0]) + i/float(N)*logQDiff
Qs.append(exp(logQ))
if len(_args) > 2:
print _args[2]
x_range = eval(_args[2])
if len(x_range) != 2:
raise ValueError("x_range '%s' is not a 2-element list" % x_range)
if len(_args) > 3:
print _args[3]
Qs = eval(_args[2])
#
NX = 50
xs = []
for i in range(NX+1):
logxDiff = log(x_range[1]) - log(x_range[0])
logx = log(x_range[0]) + i/float(NX)*logxDiff
xs.append(exp(logx))
#print "x =", xs
#print "Q =", Qs
plots = {}
for Q in Qs:
xfxs = []
for x in xs:
xfx = getPDFVals(pdffn, name, x, Q)[flav]
xfxs.append(xfx)
print "Q, x, xf(x) =", Q, zip(xs, xfxs)
plot = mpl.loglog(xs, xfxs)
plots["Q = %2.1f GeV" % Q] = plot
#mpl.legend(plots.keys(), plots.values())
mpl.show()
except:
raise
#return self.default(argstr)
def _printPDFFn(self, pdffn, argstr):
try:
_args = argstr.split(' ')
name, x, Q = _args[0:3]
vals = getPDFVals(pdffn, name, x, Q)
flav = None
if len(_args) > 3:
flav = int(_args[3])
vals = getPDFVals(pdffn, name, x, Q)
printPDFVals(vals, flav)
except:
return self.default(argstr)
def emptyline(self):
return False
def do_EOF(self, line):
return True
def do_exit(self, argstr):
return self.do_EOF(argstr)
def do_quit(self, argstr):
return self.do_EOF(argstr)
def do_version(self, argstr):
"Show library version code"
print lhapdf.getVersion()
def help_version(self, argstr):
print "Show library version code"
def do_listsets(self, argstr):
"List PDF sets, with an optional pattern match argument"
infos = lhapdf.getAllPDFSetInfo()
import re
regex = argstr or ".*"
for info in infos:
if re.search(regex, info.file, re.I) or re.search(regex, info.description, re.I):
print info.toString()
def help_listsets(self, argstr):
print "List PDF sets, with an optional pattern match argument"
def do_listids(self, argstr):
"List PDF set ID codes for all members"
infos = lhapdf.getAllPDFSetInfo()
for info in infos:
print info.id
def help_listids(self, argstr):
print "List PDF set ID codes for all members"
def do_listnames(self, argstr):
"List PDF set file names, with an optional pattern match argument"
infos = lhapdf.getAllPDFSetInfo()
import re
regex = argstr or ".*"
for info in infos:
if re.search(regex, info.file, re.I) or re.search(regex, info.description, re.I):
print "%s:%d" % (info.file, info.memberId)
def help_listnames(self, argstr):
print "List PDF set file names, with an optional pattern match argument"
def do_xfx(self, argstr):
"Calc nucleon xf(x,Q2) for set <name> with flavour index <flav>"
self._printPDFFn(lhapdf.xfx, argstr)
def help_xfx(self):
print "xfx <setId|name:memberId> <x> <Q> [<flav>]"
print "Calc nucleon xf(x,Q2) for set <name> with flavour index <flav>"
def do_plotxfx(self, argstr):
"Plot nucleon xf(x,Q2) for set <name> with flavour index <flav>"
self._plotPDFFn(lhapdf.xfx, argstr)
def help_xfx(self):
print "plotxfx <setId|name:memberId> [<x> <Q>] [<flav>]"
print "Plot nucleon xf(x,Q2) for set <name> with flavour index <flav>"
def do_xfxa(self, argstr):
"Calc nuclear xf(x,Q2) for set <name> with flavour index <flav>"
self._printPDFFn(lhapdf.xfxa, argstr)
def help_xfxa(self):
print "xfxa <setId|name:memberId> <x> <Q> [<flav>]"
print "Calc nuclear xf(x,Q2) for set <name> with flavour index <flav>"
def do_xfxp(self, argstr):
"Calc photon xf(x,Q2) for set <name> with flavour index <flav>"
self._printPDFFn(lhapdf.xfxp, argstr)
def help_xfxp(self):
print "xfxp <setId|name:memberId> <x> <Q> [<flav>]"
print "Calc photon xf(x,Q2) for set <name> with flavour index <flav>"
def do_xfxphoton(self, argstr):
"Calc MRST nucleon QED xf(x,Q2) for set <name> with shifted flavour index <flav>"
self._printPDFFn(lhapdf.xfxphoton, argstr)
def help_xfxphoton(self):
print "xfxphoton <setId|name:memberId> <x> <Q> [<flav>]"
print "Calc MRST nucleon QED xf(x,Q2) for set <name> with shifted flavour index <flav>"
if __name__ == '__main__':
## Parse command line options
from optparse import OptionParser
parser = OptionParser(usage=usage)
parser.add_option("-q", "--quiet", help="Suppress normal messages", dest="LOGLEVEL",
action="store_const", default=logging.INFO, const=logging.WARNING)
parser.add_option("-v", "--verbose", help="Add extra debug messages", dest="LOGLEVEL",
action="store_const", default=logging.INFO, const=logging.DEBUG)
opts, args = parser.parse_args()
## Configure logging
try:
logging.basicConfig(level=opts.LOGLEVEL, format="%(message)s")
except:
logging.getLogger().setLevel(opts.LOGLEVEL)
h = logging.StreamHandler()
h.setFormatter(logging.Formatter("%(message)s"))
logging.getLogger().addHandler(h)
## Run command parser
if not len(args):
LHAPDFCmd().cmdloop()
else:
wholecmd = " ".join(args)
LHAPDFCmd().onecmd(wholecmd)
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