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#! /usr/bin/env python
import os, sys, re, time, random
from math import log10, sqrt
from optparse import OptionParser
usage = """Usage: %prog <pdfid> [<pdfid>...]\n
The LHAPDF regression tester reference file builder script.
Write out xf(x,Q2) values from the given set to files for
use as regression testing reference files."""
## Parse command line options
parser = OptionParser(usage=usage)
parser.add_option("-n", "--num-samples", type=int, dest="NUMSAMPLES",
default=100, help="how many samples to take from each PDF set")
parser.add_option("-V", "--verbose", action="store_true", dest="VERBOSE",
default=False, help="print status messages")
parser.add_option("-Q", "--quiet", action="store_true", dest="QUIET",
default=False, help="be very quiet (overrides verbose and debug)")
(opts, args) = parser.parse_args()
import lhapdf
lhapdf.setVerbosity(lhapdf.SILENT)
random.seed(21344254321)
for arg in args:
pdfid = int(arg)
filename = "%d.dat" % pdfid
try:
info = lhapdf.getPDFSetInfo(pdfid)
if not opts.QUIET:
print "Dumping", opts.NUMSAMPLES, "samples from", info
lhapdf.initPDFSet(info.file, info.memberId)
x_exprange = (log10(info.lowx), log10(info.highx))
Q_exprange = (sqrt(log10(info.lowQ2)), sqrt(log10(info.highQ2)))
f = open(filename, "w")
for i in range(opts.NUMSAMPLES):
x = 10**random.uniform(*x_exprange)
Q = 10**random.uniform(*Q_exprange)
thisxfx = lhapdf.xfx(x, Q)
f.write("%e\t%e" % (x,Q))
for v in thisxfx:
f.write("\t%e" % v)
f.write("\n")
f.close()
except:
pass
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