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jorainer
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In this PR:

  • Fix conversion from XcmsExperiment objects to XCMSnExp (issue Convert XcmsExperiment to XCMSnExp object error #807).
  • Add parameter columns to chromPeakData() to allow extraction of selected columns.
  • Add support for parameter skipFilled to featureSpectra() for XcmsExperiment and XcmsExperimentHdf5 to avoid extraction of spectra for gap-filled chromatographic peaks.
  • Fix: add missing import of the spectraData() method from Spectra.

- Fix issue #812 : parameters `minFraction` and `maxFeatures` were not correctly
  considered in `plotChromPeakDensity()`.
- Add parameter `columns` to `chromPeakData()` for `XCMSnExp` and
  `XcmsExperiment` classes to allow extraction of selected columns.
- Add support for parameter `columns` to the `chromPeakData()` method for
  `XcmsExperimentHdf5` objects.
- Parameter `skipFilled` is now supported for `featureSpectra,XcmsExperiment`.
- Add unit tests checking that parameter `skipFilled` works correctly for
  `featureSpectra()` for `XcmsExperimentHdf5` objects.
@jorainer
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@sneumann , sorry to be a bit pushy here, but we should try to manage getting this PR into xcms before the next Bioconductor release. This contains some important bug fixes.

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