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Version 0.7.5

Global speedups, friendlier error handling and miscellaneous bug fixes.
Documentation updates (thanks @kyleabeauchamp; #67).
Expanded unit tests & restored continuous integration (TravisCI).
Raised the minimum pandas version to 0.17.1, the latest.

rescale (new command; #64):

- Adjust .cnr or .cns files for normal contamination or subclone fraction.
- Re-center log2 values by median (the usual), mode, mean, or biweight location.

segment:

- Detect outlier bins and ignore them during segmentation using a method similar
  to BIC-seq. Command line option: `--drop-outliers`; any outlier bins found
  will be logged.

coverage:

- If the given target BED files is missing the 4th column (gene names), fill in
  the dummy name "-" instead of crashing.

segmetrics:

- Expose alpha and #bootstraps as command-line options

antitarget:

- Reduce default bin size from 150kb to 100kb.

fix:

- Speed improvements: now about 20 times faster on exomes.

API changes:

- Gene names to treat as meaningless and to ignore in reporting (by default "-",
  ".", "CGH") can be globally configured in params.py
  (params.IGNORE_GENE_NAMES).
- vary.VariantArray (used in `scatter`) can now parse VCF files with no samples
  (genotypes).