bed-reader 1.1.0

No project description provided

Read and write the PLINK BED format, simply and efficiently.

This is the Python README. For Rust, see README-rust.md.

Highlights

• Fast multi-threaded Rust engine.
• Supports all Python indexing methods. Slice data by individuals (samples) and/or SNPs (variants).
• Used by PySnpTools, FaST-LMM, and PyStatGen.
• Supports PLINK 1.9.
• Read data locally or from the cloud, efficiently and directly.

Install

Full version: With all optional dependencies:

pip install bed-reader[samples,sparse]

Minimal version: Depends only on numpy:

pip install bed-reader

Usage

Read genomic data from a .bed file.

>>> import numpy as np
>>> from bed_reader import open_bed, sample_file
>>>
>>> file_name = sample_file("small.bed")
>>> bed = open_bed(file_name)
>>> val = bed.read()
>>> print(val)
[[ 1.  0. nan  0.]
 [ 2.  0. nan  2.]
 [ 0.  1.  2.  0.]]
>>> del bed

Read every second individual and SNPs (variants) from 20 to 30.

>>> file_name2 = sample_file("some_missing.bed")
>>> bed2 = open_bed(file_name2)
>>> val2 = bed2.read(index=np.s_[::2,20:30])
>>> print(val2.shape)
(50, 10)
>>> del bed2

List the first 5 individual (sample) ids, the first 5 SNP (variant) ids, and every unique chromosome. Then, read every genomic value in chromosome 5.

>>> with open_bed(file_name2) as bed3:
...     print(bed3.iid[:5])
...     print(bed3.sid[:5])
...     print(np.unique(bed3.chromosome))
...     val3 = bed3.read(index=np.s_[:,bed3.chromosome=='5'])
...     print(val3.shape)
['iid_0' 'iid_1' 'iid_2' 'iid_3' 'iid_4']
['sid_0' 'sid_1' 'sid_2' 'sid_3' 'sid_4']
['1' '10' '11' '12' '13' '14' '15' '16' '17' '18' '19' '2' '20' '21' '22'
 '3' '4' '5' '6' '7' '8' '9']
(100, 6)

From the cloud: open a file and read data for one SNP (variant) at index position 2.

>>> with open_bed("https://raw.githubusercontent.com/fastlmm/bed-sample-files/main/small.bed") as bed:
...     val = bed.read(index=np.s_[:,2], dtype="float64")
...     print(val)
[[nan]
 [nan]
 [ 2.]]

Project Links

• Documentation
• Questions to: [e-mail]
• Source code
• PyPI
• Bug reports
• Mailing list
• Project Website
• Change Log