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**Generic Workflow Nodes for KNIME: OpenMS** version **2.5.0.202002201806** by **Freie Universitaet Berlin, Universitaet Tuebingen, and the OpenMS Team**

Applies retention time transformations to maps.

- version
- Version of the tool that generated this parameters file.
- invert
- Invert transformation (approximatively) before applying it
- store_original_rt
- Store the original retention times (before transformation) as meta data in the output file
- log
- Name of log file (created only when specified)
- debug
- Sets the debug level
- threads
- Sets the number of threads allowed to be used by the TOPP tool
- no_progress
- Disables progress logging to command line
- force
- Overwrite tool specific checks.
- test
- Enables the test mode (needed for internal use only)
- type
- Type of model
- symmetric_regression
- Perform linear regression on 'y - x' vs. 'y + x', instead of on 'y' vs. 'x'.
- x_weight
- Weight x values
- y_weight
- Weight y values
- x_datum_min
- Minimum x value
- x_datum_max
- Maximum x value
- y_datum_min
- Minimum y value
- y_datum_max
- Maximum y value
- wavelength
- Determines the amount of smoothing by setting the number of nodes for the B-spline. The number is chosen so that the spline approximates a low-pass filter with this cutoff wavelength. The wavelength is given in the same units as the data; a higher value means more smoothing. '0' sets the number of nodes to twice the number of input points.
- num_nodes
- Number of nodes for B-spline fitting. Overrides 'wavelength' if set (to two or greater). A lower value means more smoothing.
- extrapolate
- Method to use for extrapolation beyond the original data range. 'linear': Linear extrapolation using the slope of the B-spline at the corresponding endpoint. 'b_spline': Use the B-spline (as for interpolation). 'constant': Use the constant value of the B-spline at the corresponding endpoint. 'global_linear': Use a linear fit through the data (which will most probably introduce discontinuities at the ends of the data range).
- boundary_condition
- Boundary condition at B-spline endpoints: 0 (value zero), 1 (first derivative zero) or 2 (second derivative zero)
- span
- Fraction of datapoints (f) to use for each local regression (determines the amount of smoothing). Choosing this parameter in the range .2 to .8 usually results in a good fit.
- num_iterations
- Number of robustifying iterations for lowess fitting.
- delta
- Nonnegative parameter which may be used to save computations (recommended value is 0.01 of the range of the input, e.g. for data ranging from 1000 seconds to 2000 seconds, it could be set to 10). Setting a negative value will automatically do this.
- interpolation_type
- Method to use for interpolation between datapoints computed by lowess. 'linear': Linear interpolation. 'cspline': Use the cubic spline for interpolation. 'akima': Use an akima spline for interpolation
- extrapolation_type
- Method to use for extrapolation outside the data range. 'two-point-linear': Uses a line through the first and last point to extrapolate. 'four-point-linear': Uses a line through the first and second point to extrapolate in front and and a line through the last and second-to-last point in the end. 'global-linear': Uses a linear regression to fit a line through all data points and use it for interpolation.
- interpolation_type
- Type of interpolation to apply.
- extrapolation_type
- Type of extrapolation to apply: two-point-linear: use the first and last data point to build a single linear model, four-point-linear: build two linear models on both ends using the first two / last two points, global-linear: use all points to build a single linear model. Note that global-linear may not be continuous at the border.

- Input file to transform (separated by blanks) [mzML,featureXML,consensusXML,idXML,opt.]
- Transformation to apply [trafoXML]

- Output file (same file type as 'in'). This option or 'trafo_out' has to be provided; they can be used together. [mzML,featureXML,consensusXML,idXML]
- Transformation output file. This option or 'out' has to be provided; they can be used together. [trafoXML]

- MapRTTransformer Std Output
- The text sent to standard out during the execution of MapRTTransformer.
- MapRTTransformer Error Output
- The text sent to standard error during the execution of MapRTTransformer. (If it appears in gray, it's the output of a previously failing run which is preserved for your trouble shooting.)

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- MHCquant (KNIME Hub)

To use this node in KNIME, install OpenMS from the following update site:

KNIME 4.2

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