/usr/bin/lhapdf-query is in python-lhapdf 5.9.1-5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | #! /usr/bin/python
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)
|