# Spectra 1.20

## Change 1.20.1

- Fix in `precursorPurity()` if no MS1 peak with an m/z similar to an MS2
  spectra's precursor m/z is found.

# Spectra 1.19

## Change 1.19.11

- Fix in `longForm()` method for `MsBackendMemory` if only peaks variables are
  extracted.

## Change 1.19.10

- Add default implementation of methods for the `MsBackend` class (issue
  [#338](https://github.com/rformassspectrometry/Spectra/issues/338)). This
  reduced code redundancy in *Spectra* and simplifies implementation of new
  `MsBackend` classes considerably.

## Change 1.19.9

- Add implementations of `spectraVariableMapping()` and
  `spectraVariableMapping<-` for `MsBackend` and `Spectra` objects.

## Change 1.19.8

- Add default implementations for `MsBackend` for replacement methods
  `centroided<-`, `collisionEnergy<-`, `dataOrigin<-`,
  `isolationWindowLowerMz<-`, `isolationWindowTargetMz<-`,
  `isolationWindowUpperMz<-`, `msLevel<-`, `polarity<-`, `precursorMz<-`,
  `rtime<-` and `smoothed<-`. This reduces the amount of methods required to be
  implemented for new `MsBackend` classes.

## Change 1.19.7

- Add `longForm,MsBackend` and `longForm,Spectra` methods (issue
  [#360](https://github.com/rformassspectrometry/Spectra/issues/360)).

## Change 1.19.6

- Add a `precursorPurity()` function.

## Change 1.19.5

- Addition of `fragmentGroupIndex()` function. This function generates a
  `integer` index grouping MSn (MS level > 1) spectra with their corresponding
  (unique) MS1 spectra based on acquisition order.
- Fix on `cbind2()` so that the output is a `Spectra` object and not the
  backend.

## Change 1.19.4

- Fix passing of `BPPARAM` parameter in `peaksData()` method for `Spectra`.
  Now is being passed down to `.peaksapply()`.

## Change in 1.19.3

- Fix in `estimatePrecursorMz()` that would ignore parameter `BPPARAM`.


## Change in 1.19.2

- Fix export of data using `MsBackendMzR`: save also the precursor scan number
  for MSn data (spectra variable `"precScanNum"`).

## Change in 1.19.1

- Add `precScanNum()` method for `MsBackendCached`.

# Spectra 1.17

## Change in 1.17.10

- Accept `labels` argument as a `list` instead of a `character` in the
  plotting functions.

## Change in 1.17.9

- Allow parameter `msLevel. = integer()` for `filterRt()` to filter spectra of
  **all** MS levels. This was `msLevel. = uniqueMsLevels()`, which, depending
  on the backend, can be computationally intense. Add related unit tests to
  the unit test suite.

## Change in 1.17.8

- Add parameter `return.type` to `peaksData()`.

## Change in 1.17.7

- Add the `spectraVariableMapping<-` generic method.

## Change in 1.17.6

- Add new `fillCoreSpectraVariables()` function that allows to add eventually
  missing *core* spectra variables (with the correct data type) to a data frame.

## Change in 1.17.5

- Move generics `processingChunkSize()`, `processingChunkFactor()` and
  `applyproceesing()` to *ProtGenerics*. Required *ProtGenerics* version
  1.39.2 or higher. These were moved to be able to implement them in the
  *Chromatograms* package.

## Change in 1.17.4

- Import `extractByIndex()` from *ProtGenerics*.

## Change in 1.17.3

- Fix `cbind2()` unit test for backends that fails if the number of spectra in
  the tested backend is (by chance) equal to 4.

## Change in 1.17.2

- Add `cbind2()` method to easily add multiple `spectraVariables` and their
  content to the `spectraData` of a `Spectra` object.
  See also [issue #342](https://github.com/rformassspectrometry/Spectra/issues/342)

## Changes in 1.17.1

- Refactor `containsMz()` to support chunk-wise processing.

# Spectra 1.15

## Changes in 1.15.13

- Add `precursorMz<-` method [issue #336](https://github.com/rformassspectrometry/Spectra/issues/336).

## Changes in 1.15.12

- Add generic `backendRequiredSpectraVariables()` to allow definition of
  mandatory spectra variables for a backend.

## Changes in 1.15.11

- Add reference to `MsBackendMetaboLights`.

## Changes in 1.15.10

- Add new `extractSpectra()` generic and implementation for `MsBackend`. Fixes
  [issue #5](https://github.com/rformassspectrometry/MsBackendMetaboLights/issues/5).

## Changes in 1.15.9

- Restructure and reorganize documentation for `Spectra`.

## Changes in 1.15.8

- Refactor the `Spectra()` constructor method: better support for
  initialization of backends that define their own specific parameters.

## Changes in 1.15.7

- Change `estimatePrecursorIntensity()` to a method to avoid overrides/clashes
  with the same-named implementation in *xcms*.

## Changes in 1.15.6

- Fix in `selectSpectraVariables()` for `MsBackendMzR`: ensure peaks variables
  `"mz"` and `"intensity"` are not by default removed.

## Changes in 1.15.5

- Add new `filterPeaksRanges()` function to filter mass peaks by ranges on
  numeric spectra or peak variables.

## Changes in 1.15.3

- For evaluation of the `Spectra`'s processing queue: call functions from the
  *MetaboCoreUtils* directly through their namespace (`MsCoreUtils::`) to avoid
  errors if performed in parallel on Windows machines or if called on a
  re-loaded object.
- New `asDataFrame()` function to convert a (small) `Spectra` object
  into a long `DataFrame`.

## Changes in 1.15.2

- Add `dataStorageDataPath()` and `dataStorageDataPath<-` methods to allow
  updating/adapting the path of the data storage files of backends supporting
  that [issue #321](https://github.com/rformassspectrometry/Spectra/issues/321).

## Changes in 1.15.1

- Improve documentation for `combineSpectra()` and `combinePeaks()` [issue
  #320](https://github.com/rformassspectrometry/Spectra/issues/320).

# Spectra 1.13

## Changes in 1.13.8

- Add `estimatePrecursorMz()` function to *estimate* the precursor m/z for DDA
  fragment spectra from previous MS1 spectra [issue
  #315](https://github.com/rformassspectrometry/Spectra/issues/315).

## Changes in 1.13.7

- Move generics `backendBpparam()`, `backendParallelFactor()` and
  `supportsSetBackend()` to *ProtGenerics*. Required *ProtGenerics* version
  1.35.4 or higher.

## Changes in 1.13.6

- Add `filterRanges()` and `filterValues()` functions to allow filtering of a
  Spectra object based on ranges or similarities of any existing `spectraData`
  variables.

## Changes in 1.13.5

- Move generics to `ProtGenerics`. Requires `ProtGenerics` version 1.35.3.

## Changes in 1.13.4

- Add `entropy` and `nentropy` functions to allow to calculate the (normalized)
  entropy for each spectrum.

## Changes in 1.13.3

- Fix issue in `setBackend` that might cause chunk-wise processing to be not
  run.

## Changes in 1.13.2

- Add possibility to enable and perform chunk-wise (parallel) processing to
  `Spectra`: add functions `processingChunkSize`, `backendParallelFactor` and
  `processingChunkFactor` to set or get definition of chunks for parallel
  processing. All functions working on peaks data use this mechanism which
  is implemented in the internal `.peaksapply` function. The `Spectra` object
  gains a new slot `"processingChunkSize"` that is used to define the
  size of the processing chunks for the `Spectra`. See also [issue
  #304](https://github.com/rformassspectrometry/Spectra/issues/304).
  This ensures processing also of very large data sets.

## Changes in 1.13.1

- Fix issue with `bin` function (see
  [issue #302](https://github.com/rformassspectrometry/Spectra/issues/303)).
  Addition of `zero.rm` parameter to prevent creation of *empty* bins.

# Spectra 1.11

## Changes in 1.11.11

- Fix issue with `filterFourierTransformArtefacts` function (see [issue
  #302](https://github.com/rformassspectrometry/Spectra/issues/302)). Thanks
  Adriano Rutz for reporting.

## Changes in 1.11.10

- `peaksData,MsBackendMemory` returns a `data.frame` if additional peak
  variables (in addition to `"mz"` and `"intensity"`) are requested. For
  `columns = c("mz", "intensity")` (the default) a `list` of `matrix` is
  returned.
- `peaksData,Spectra` returns either a `matrix` or `data.frame` and ensures
  the peak data is correctly subset based on the lazy evaluation processing
  queue.
- `$,Spectra` to access peak variables ensures the lazy evaluation queue is
  applied prior to extracting the values.
- `applyProcessing` correctly subsets and processes all peak variables
  depending on the processing queue.
- `spectraData<-,Spectra` throws an error if processing queue is not empty and
  values for peaks variables should be replaced.
- `$<-,Spectra` throws an error if processing queue is not empty and a peaks
  variable is going to be replaced.
- Add full support for additional peaks variables to `MsBackendDataFrame`.

## Changes in 1.11.9

- Add `filterPrecursorPeaks` to allow filtering peaks within each spectrum
  with m/z values relative to the precursor m/z of the spectrum.

## Changes in 1.11.8

- Add an example to the vignette describing how spectral similarity scores from
  the *msentropy* package can be used with `compareSpectra`.

## Changes in 1.11.7

- Fix in `compareSpectra` to also pass parameters `ppm` and `tolerance` to
  the peak similarity calculation functions `FUN`: this allows to use custom
  similarity function with integrated mapping of peaks.
- Add `joinPeaksNone` to skip the peak matching in `compareSpectra` if the
  similarity scoring function performs its own peak matching.
- Only use parallel processing in `setBackend,Spectra` if both backends support
  it.

## Changes in 1.11.6

- Add `filterPrecursorMaxIntensity` function.
- Add `filterPrecursorIsotopes` function.

## Changes in 1.11.5

- Add `scalePeaks` function (see [issue
  #291](https://github.com/rformassspectrometry/Spectra/issues/291)).

## Changes in 1.11.4

- Import `uniqueMsLevels` from `ProtGenerics`.

## Changes in 1.11.3

- Rename `combinePeaks` for lists of peak matrices into `combinePeaksData`.
- Add `combinePeaks` generics.
- Add `combinePeaks,Spectra` to combine peaks within each spectrum in a
  `Spectra`.

## Changes in 1.11.2

- Add `deisotopeSpectra` and `reduceSpectra` functions.

## Changes in 1.11.1

- Add example for filtering precursor m/z peaks from fragment spectra to the
  vignette.

# Spectra 1.9

## Changes in 1.9.15

- Fix issue in `MsBackendMemory` failed to return intensity or m/z values when
  peaks data is empty.
- Fix bug in `filterPrecursorScan()` (see #194 and PR #277).

## Changes in 1.9.14

- Fix issue with `filterMzValues` that would only keep (or remove) the first
  matching peak instead of all matching peaks (given `ppm` and `tolerance`).
  Issue [#274](https://github.com/rformassspectrometry/Spectra/issues/274).
- Add parameter `keep` to `filterMzRange` to support keeping or removing
  matching peaks.

## Changes in 1.9.13

- Add the `backendBpparam` method that allows to evaluate whether a `MsBackend`
  supports the provided (or the default) `BiocParallel`-based parallel
  processing setup.
- Minor tweaks in the internal `.peaksapply` function to avoid splitting/merging
  of data if not needed (e.g. if no parallel processing is performed).
- Minor tweaks in spectra comparison functions to avoid repeated calling of
  functions in loops.

## Changes in 1.9.12

- Extend the list of available `MsBackend` backends provided by other packages
  (in the README and in the package vignette).

## Changes in 1.9.11

- Fix headers in `MsBackend` vignette.

## Changes in 1.9.10

- Add `supportsSetBackend` method for `MsBackend` to specify whether a backend
  supports `setBackend,Spectra`.
- `setBackend` checks using `supportsSetBackend` whether a backend supports
  `setBackend`.

## Changes in 1.9.9

- Refactor `setBackend` to only split and merge backends if necessary and
  to not change `dataOrigin` of the original backend.
- Support `setBackend` with `MsBackendMemory` for an empty `Spectra` object
  (issue [#268](https://github.com/rformassspectrometry/Spectra/issues/268)).
- Disable automatic detection of peak variables for `MsBackendMemory` (issue
  [#269](https://github.com/rformassspectrometry/Spectra/issues/269)).
- Fix issue in `Spectra` with empty `character` (issue
  [#267](https://github.com/rformassspectrometry/Spectra/issues/267)).

## Changes in 1.9.8

- Address comments from Michele Stravs regarding the `MsBackend` vignette.
- Add additional tests checking for `MsBackend` compliance.

## Changes in 1.9.7

- Add a vignette describing how to build a `MsBackend` from scratch (issue
  #262).
- Extend unit test suite to evaluate validity of `MsBackend` implementations.

## Changes in 1.9.6

- Replace `<=` with `between` calls.

## Changes in 1.9.5

- Fix bug in `containsMz()` when `mz` isn't ordered (see #258).

## Changes in 1.9.4

- Fix error when extracting spectra variables from a `MsBackendMzR` of
  length 0.

## Changes in 1.9.3

- Add `chunkapply` function to split a `Spectra` into chunks and
  stepwise apply a function `FUN` to each.

## Changes in 1.9.2

- `combineSpectra` on `Spectra` with read-only backends change backend
  to an `MsBackendMemory` instead of an `MsBackendDataFrame`.

## Changes in 1.9.1

- Expand documentation on `compareSpectra` for GNPS-like similarity
  scoring.

## Changes in 1.9.0

- Bioconductor 3.17 developmental version.

# Spectra 1.7

## Changes in 1.7.5

- Force serial processing in some unit tests to avoid potential
  failures on some Bioconductor build and check servers (under some
  circumstances).

## Changes in 1.7.4

- Add `MsBackendMemory` backend class providing a more efficient
  in-memory data representation than `MsBackendDataFrame`.

## Changes in 1.7.3

- Import `spectrapply` from `ProtGenerics`.

## Changes in 1.7.2

- Fix `setBackend` if provided `Spectra` is empty.
- `backendInitialize,Spectra,MsBackendDataFrame` returns a `Spectra`
  object with the full provided spectra data.

## Changes in 1.7.1

- Add `uniqueMsLevels` function to allow more efficient,
  backend-specific, implementations for retrieving unique MS levels
  from a data set.

# Spectra 1.5

## Changes in 1.5.20

- Add parameters `ppm` and `tolerance` to `PrecursorMzParam` (for
  neutral loss calculation) and add option `filterPeaks =
  "removePrecursor"`.

## Changes in 1.5.19

- Improved the `bin` method.

## Changes in 1.5.18

- Set default for parameter `columns` in `peaksData,Spectra` and
  `peaksData,MsBackend` to `c("mz", "intensity")`.

## Changes in 1.5.17

- Add `peaksVariables` method and add parameter `columns` (or `...`) to
  `peaksData`.
- Add `columns` parameter to the `peaksData` method of
  `MsBackendDataFrame`, `MsBackendMzR` and `MsBackendHdf5peaks`.

## Changes in 1.5.16

- Fix issue in `neutralLoss` that would prevent calculation of neutral
  loss spectra if

## Changes in 1.5.15

- Fix typo in MZ delta plot title.

## Changes in 1.5.14

- Add `coreSpectraVariables` function to export the *core* spectra
  variables and their expected data types.

## Changes in 1.5.13

- Fix figure sizes in vignette.

## Changes in 1.5.12

- Add `neutralLoss` method and first algorithm to calculate neutral loss
  spectra.

## Changes in 1.5.11

- Fix neutral loss example in the vignette.

## Changes in 1.5.10

- Add citation.

## Changes in 1.5.9

- Add examples for `combineSpectra` to the vignette.

## Changes in 1.5.8

- Add `spectraVariableMapping` generic.

## Changes in 1.5.7

- Add missing export of the `filterPrecursorMz` method.

## Changes in 1.5.6

- Add `filterPrecursorMzValue` method which allows to filter using
  multiple precursor m/z values (issue
  [#230](https://github.com/rformassspectrometry/Spectra/issues/230)).
- Fix unit test suite.

## Changes in 1.5.5

- Add a testing framework allowing to run standardized unit tests for
  new `MsBackend` implementations (issue
  [#186](https://github.com/rformassspectrometry/Spectra/issues/186)).

## Changes in 1.5.4

- Add the `MsBackendCached` backend.

## Changes in 1.5.3

- Only calculate number of peaks per spectra if the processing queue
  of the `Spectra` is not empty. Otherwise call the backend's
  implementation (issue [MsBackendSql
  #31](https://github.com/rformassspectrometry/MsBackendSql/issues/31)).

## Changes in 1.5.2

- Small documentation update (related to `MsCoreUtils` issue
  [#87](https://github.com/rformassspectrometry/MsCoreUtils/issues/87)).
- New `countIdentifications()` function.
- Add `filterFourierTransformArtefacts` function to remove fast
  fourier artefact peaks seen on e.g. Orbitrap instruments (issue
  #223).

## Changes in 1.5.1

- Don't read header information when importing peaks matrix on macOS.

# Spectra 1.3

## Changes in 1.3.11

- Fix error message in `setBackend` (issue
  [#217](https://github.com/rformassspectrometry/Spectra/issues/217)).

## Changes in 1.3.10

- Fix bug in `plotSpectra` and `plotSpectraMirror` that would cause an error if
  the number of peaks in a spectrum was 1 and labels were provided.

## Changes in 1.3.9

- New features: `joinSpectraData()` now check for duplicated keys in
  `x` (throws an error) and `y` (thows a warning).

## Changes in 1.3.8

- New features: `plotMzDelta()` function to M/Z delta QC (ported from
  MSnbase).

## Changes in 1.3.7

- Add fix from `MSnbase` (issue
  [#170](https://github.com/lgatto/MSnbase/issues/170)) to `Spectra`: on macOS
  require reading also the spectrum header before reading the peaks data.

## Changes in 1.3.6

- Documentation updates for `combineSpectra` and `combinePeaks`.

## Changes in 1.3.5

- `filterMzValues` supports also removing peaks matching specified m/z values
  (issue [#209](https://github.com/rformassspectrometry/Spectra/issues/209)).

## Changes in 1.3.4

- Add list of additional R packages and repositories providing `MsBackend`
  backends to the vignette.

## Changes in 1.3.3

- Move generics for `bin` and `compareSpectra` to `ProtGenerics`.

## Changes in 1.3.2

- Add parameter `f` to `filterPrecursorScan` to fix issue
  [#194](https://github.com/rformassspectrometry/Spectra/issues/194).

## Changes in 1.3.1

- Add `estimatePrecursorIntensity` function (issue
  [#202](https://github.com/rformassspectrometry/Spectra/issues/202)).


# Spectra 1.1

## Changes in 1.1.20

- Fix concatenating empty spectra (issue
  [#200](https://github.com/rformassspectrometry/Spectra/issues/200)).

## Changes in 1.1.19

- New `filterPrecursorCharge()` method.

## Changes in 1.1.18

- Define `plotSpectraMirror` as a method.

## Changes in 1.1.17

- Fix issue [#187](https://github.com/rformassspectrometry/Spectra/issues/187).
- Add function `concatenateSpectra` to allow concatenating `Spectra` objects and
  list of `Spectra` objects.

## Changes in 1.1.16

- Support arbitrary spectra variables to be passed to the functions
  provided/added with `addProcessing`; issue
  [#182](https://github.com/rformassspectrometry/Spectra/issues/182).

## Changes in 1.1.15

- Pass spectras' precursor m/z to the `MAPFUN` in `compareSpectra`; issue
  [#171](https://github.com/rformassspectrometry/Spectra/issues/171).
- Add `joinPeaksGnps` to perform a peak matching between spectra similar to the
  one performed in GNPS (issue
  [#171](https://github.com/rformassspectrometry/Spectra/issues/171)).

## Changes in 1.1.14

- Support plotting of empty spectra (issue
  [175](https://github.com/rformassspectrometry/Spectra/issues/175)).

## Changes in 1.1.13

- Move `ProcessingStep` to `ProtGenerics`.

## Changes in 1.1.12

- Fix `show` method for `Spectra` to list only the 3 most recent processing
  steps (issue
  [173](https://github.com/rformassspectrometry/Spectra/issues/173)).
- Add `processingLog` function to display the log messages of all processing
  steps of a `Spectra` object.

## Changes in 1.1.11

- Add support for `...` to `pickPeaks` and `smooth` (issue
  [168](https://github.com/rformassspectrometry/Spectra/issues/168)).

## Changes in 1.1.10

- Import `filterIntensity` from `ProtGenerics`.

## Changes in 1.1.9

- Fix label in `plotSpectra`.

## Changes in 1.1.8

- `filterIntensity` supports passing of additional parameters to the used
  filter function (issue
  [164](https://github.com/rformassspectrometry/Spectra/issues/164)).

## Changes in 1.1.7

- Fix bug in `show,ProcessingStep` (issue
  [162](https://github.com/rformassspectrometry/Spectra/issues/162)).

## Changes in 1.1.6

- New `joinSpectraData()` function.

## Changes in 1.1.5

- Add `[[,Msbackend` and `[[<-,MsBackend` methods (issue
  [149](https://github.com/rformassspectrometry/Spectra/issues/149)).
- Add `[[,Spectra` and `[[<-,Spectra` methods.

## Changes in 1.1.4

- Fix issue with `labelCol` in `plotSpectra` (issue
  [#157](https://github.com/rformassspectrometry/Spectra/issues/157)).

## Changes in 1.1.3

- Implement a generic `Spectra,ANY` constructor replacing `Spectra,DataFrame`
  and `Spectra,character`.

## Changes in 1.1.2

- Fix problem in export to mzML files that failed for empty spectra (issue
  [#145](https://github.com/rformassspectrometry/Spectra/issues/145))

## Changes in 1.1.1

- Round retention time in figure titles.
- Document differences between `spectrumId` (`spectrumID`),
  `acquisitionNum` and `scanIndex`.

## Changes in 1.1.0

- New Bioc devel version

# Spectra 0.99

## Changes in 0.99.11

- Re-add `mz` and `intensity` as core spectra variables.

## Changes in 0.99.10

- Fix in `spectraData<-,Spectra` to avoid removing m/z and intensity values
  (issue [#146](https://github.com/rformassspectrometry/Spectra/issues/146)).
- Add default implementations of filter functions for `MsBackend`.

## Changes in 0.99.9

- Fix in `Spectra,character` constructor to ensure the backend is changed even
  if `source` inherits from `backend` (issue
  [#143](https://github.com/rformassspectrometry/Spectra/issues/143)).

## Changes in 0.99.8

- `combineSpectra` applies data processing steps in the processing queue prior to
  combination (issue
  [#140](https://github.com/rformassspectrometry/Spectra/issues/140)).

## Changes in 0.99.7

- Fix problem in `dropNaSpectraVariables` that would also drop m/z and
  intensity values for most backends (issue
  [#138](https://github.com/rformassspectrometry/Spectra/issues/138).

## Changes in 0.99.6

- Support `intensity` in `filterIntensity` method to be a function to enable
  peak intensity-based filtering of spectra (issue
  [#126](https://github.com/rformassspectrometry/Spectra/issues/126)).

## Changes in 0.99.5

- Add `filterMzRange` and `filterMzValues` to filter spectra based on an m/z
  range or a list of target m/z values, respectively.

## Changes in 0.99.4

- Add `export,MsBackendMzR` to export spectra data to mzML or mzXML file(s).
- Add an `export,MsBackend` method to allow backends to take care of data
  export.
- Refactor `export,Spectra` to use the `MsBackend` class to export the data.
- Change parameter `source` in `Spectra,character` to `MsBackendMzR` and set
  parameter `backend = source`. Thus by default, the import backend will also
  be used to store the data.

## Changes in 0.99.3

- Replace `lapply,Spectra` with `spectrapply,Spectra`.

## Changes in 0.99.2

- Replace `asDataFrame,MsBackend` with `spectraData,MsBackend`.
- Replace `asDataFrame<-,MsBackend` with `spectraData<-,MsBackend`.
- Replace `as.list,MsBackend` with `peaksData,MsBackend`.
- Replace `replaceList<-,MsBackend` with `peaksData<-,MsBackend`.
- Replace `as.list,Spectra` with `peaksData,Spectra` and add methods to coerce a
  `Spectra` to a `list` or `SimpleList`.

## Changes in 0.99.0

- Add `reset` method.
- Add processing by chunk to `compareSpectra`.
