d = Dataset(args.dataset)
A = SnpSubset(d, GenomicSubset(args.subset).bedtool)
if args.path_to_R is not None:
R = pickle.load(open(args.path_to_R))
else:
R = None
newA = IntRangeSet()
for r in A.expanded_by(0.003).irs.ranges():
S = IntRangeSet([a-r[0] for a in A.irs & IntRangeSet(r)])
print(r, 'analyzing', len(S), 'snps')
if R is None:
X = d.get_standardized_genotypes(r)
cov = X.T.dot(X) / d.N
else:
cov = R.ranges_to_arrays[r]
while True:
new = get_high_ld_snps(S, cov)
if len(new) == 0:
break
else:
print('\tadding', len(new), 'snps')
print('\t\tbefore', S)
S += new
print('\t\tafter', S)
newA += IntRangeSet([s+r[0] for s in S])
b = BedTool([interval_from_range(r) for r in newA.ranges()])
print(b)
b.saveas(paths.genome_subsets + args.subset + '.R2ge{:0.2}.bed'.format(args.R2_threshold))
class SnpSubset(object):
def __init__(self, dataset, bedtool=None, irs=None):
# use bedtools to create an indicator vector for the snps membership in the subset
self.dataset = dataset
if bedtool:
indicator = dataset.snp_coords().intersect(bedtool, c=True)
self.irs = IntRangeSet(np.flatnonzero(
np.array([int(snp.name) for snp in indicator])))
elif irs:
self.irs = irs
else:
self.irs = IntRangeSet()
def num_snps(self):
return len(self.irs)
def expand_by(self, expansion_in_each_direction, units='Morgans'):
result = IntRangeSet()
for r in self.irs.ranges():
result += self.dataset.buffer_around_slice(
r, expansion_in_each_direction, units=units)
self.irs = result
def expanded_by(self, expansion_in_each_direction, units='Morgans'):
result = copy.copy(self)
result.expand_by(expansion_in_each_direction, units=units)
return result
# prints subsets in the appropriate format for ldsc
# all subsets must have the same dataset
@classmethod
def print_subsets(cls, outfilename, snpsubsets, names, add_other=False):
def snp_info_df(d):
bfile = d.genotypes_bedfile.filename
return pd.read_csv(bfile + '.bim',
delim_whitespace=True,
usecols=[0,1,2,3],
names=['CHR','SNP','CM','BP'])
# check that all snpsubsets have the same data set
if len(set([ss.dataset for ss in snpsubsets])) > 1:
print('error: all subsets must have the same underlying dataset')
return
if not outfilename.endswith('.gz'):
print('outfilename must end with ".gz". I only write zipped files')
return
# get snp info for this dataset
d = snpsubsets[0].dataset
df = snp_info_df(d)
# add the 'other' annotation if necessary
if add_other:
union = IntRangeSet()
for ss in snpsubsets:
union.update(ss.irs)
snpsubsets.append(SnpSubset(d, irs=d.all_snps() - union))
names.append('OTHER')
# create the pandas dataframe and output it
for name, ss in zip(names, snpsubsets):
df[name] = 0
df.ix[[i for i in ss.irs], name] = 1
df = df[['CHR','BP','SNP','CM'] + names]
with gzip.open(outfilename, 'wt') as write_file:
df.to_csv(write_file, index=False, sep='\t')
