Preprocessing:Extract
From QuB
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Extract saves a new data file from the Data Source. The file can be sampled or idealized, processed or raw, all or some A/D channels.
Properties
- Output file name
- by default, the source file name with "x" at the end. Click "..." to use a standard Save dialog.
- Open file after extraction
- opens the extracted file in QuB after writing it.
- Data source
- which data to extract
- Pre-process data
- None
- extracts sampled data exactly as it is on disk
- As such
- apply the low-pass filter and/or baseline correction as defined in the data
- resample to a new sampling rate -- QuB interpolates linearly between samples
- Proc. only the active channel
- Apply pre-processing to the active channel, or to all A/D channels.
- Output format
- see Data Theory#Data File Types. The choices are:
- QDF -- QuB native, full-featured sampled data
- LDT -- QuB legacy, compatible with our stuff from 10 years ago (and maybe others?)
- DAT -- raw binary, no headers
- ASC -- tab-separated text file, with optional time (x) column and fit column
- new option: Segments in columns: instead of writing all data in one column, one segment after another, it writes the segments in parallel, each in its own column.
- WAV -- sound file
- DWT -- idealized data
- All A/D channels / Only active channel / list of channels
- choose which signal lines to extract. The list is comma- or space-delimited. Channel numbers start with 0.
- Join segments
- for sampled data, the extracted file will have a single data segment made by concatenating all the source segments/selections.
- for idealized (DWT) data, the extracted file will have closed events between the source segments/selections
- Drop First/Last Evt (per seg)
- (idealized data only)
- omits the first and last event of each segment. e.g. if you're extracting a list of selections where each selection is a burst along with a little bit of desensitized at the beginning and end, but you want to exclude the desensitized events.
- If Class
- Drops the first and/or last events only if they are closed (class 0) or open (class 1).
- Presets
- fills all fields of this dialog from a stored preset, or "add to menu" a new preset with the current settings
- Advanced
- Shows the following additional options:
- Operation
- Add
- Adds all source segments/selections together pointwise to make one output segment
- Sub
- Subtracts the first source segment (e.g. a leak trace) from each of the others, to make N-1 output segments
- List
- Subtracts the data in a selection list from the source segments (??)
- Avg
- Averages all source segments to make one output segment containing the mean at each point
- Std
- Averages all source segments, makes one output segment containing the standard deviation from the mean at each point.
- Scale
- Multiplies each data point by a constant
- Function
- Drift
- Adds a straight line to the data
- Sine
- Adds a sin/cos wave to the data
- Digitize using half-amp threshold
- Replaces each data point with either Min or Max, depending on whether it is less or greater than the Threshold
- Leak+Cap subtraction
- using the equation displayed, with the parameters from Modeling:Exp
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