pymovements.gaze.GazeDataFrame#

A DataFrame for gaze time series data.

Each row is a sample at a specific timestep. Each column is a channel in the gaze time series.

Initialize a pymovements.gaze.gaze_dataframe.GazeDataFrame.

Parameters:

data (pl.DataFrame) – A dataframe to be transformed to a polars dataframe.
experiment (Experiment) – The experiment definition.
time_column – The name if the timestamp column in the input data frame.
pixel_columns – The name of the pixel position columns in the input data frame. These columns will be nested into the column pixel. If the list is empty or None, the nested pixel column will not be created.
position_columns – The name of the dva position columns in the input data frame. These columns will be nested into the column position. If the list is empty or None, the nested position column will not be created.
velocity_columns – The name of the velocity columns in the input data frame. These columns will be nested into the column velocity. If the list is empty or None, the nested velocity column will not be created.
acceleration_columns – The name of the acceleration columns in the input data frame. These columns will be nested into the column acceleration. If the list is empty or None, the nested acceleration column will not be created.

Notes

About using the arguments pixel_columns, position_columns, velocity_columns, and acceleration_columns:

By passing a list of columns as any of these arguments, these columns will be merged into a single column with the corresponding name , e.g. using pixel_columns will merge the respective columns into the column pixel.

The supported number of component columns with the expected order are:

zero columns: No nested component column will be created.
two columns: monocular data; expected order: x-component, y-component
four columns: binocular data; expected order: x-component left eye, y-component left eye, x-component right eye, y-component right eye,
six columns: binocular data with additional cyclopian data; expected order: x-component left eye, y-component left eye, x-component right eye, y-component right eye, x-component cyclopian eye, y-component cyclopian eye,

Examples

First let’s create an example DataFrame with three columns: the timestamp t and x and y for the pixel position.

>>> df = pl.from_dict(
...     data={'t': [1000, 1001, 1002], 'x': [0.1, 0.2, 0.3], 'y': [0.1, 0.2, 0.3]},
... )
>>> df
shape: (3, 3)
┌──────┬─────┬─────┐
│ t    ┆ x   ┆ y   │
│ ---  ┆ --- ┆ --- │
│ i64  ┆ f64 ┆ f64 │
╞══════╪═════╪═════╡
│ 1000 ┆ 0.1 ┆ 0.1 │
│ 1001 ┆ 0.2 ┆ 0.2 │
│ 1002 ┆ 0.3 ┆ 0.3 │
└──────┴─────┴─────┘

We can now initialize our GazeDataFrame by specyfing the names of the pixel position columns.

>>> gaze = GazeDataFrame(data=df, pixel_columns=['x', 'y'])
>>> gaze.frame
shape: (3, 2)
┌──────┬────────────┐
│ t    ┆ pixel      │
│ ---  ┆ ---        │
│ i64  ┆ list[f64]  │
╞══════╪════════════╡
│ 1000 ┆ [0.1, 0.1] │
│ 1001 ┆ [0.2, 0.2] │
│ 1002 ┆ [0.3, 0.3] │
└──────┴────────────┘

Methods

`__init__`([data, experiment, trial_columns, ...])	Initialize a `pymovements.gaze.gaze_dataframe.GazeDataFrame`.
`copy`()	Return a copy of the GazeDataFrame.
`nest`(input_columns, output_column)	Nest component columns into a single tuple column.
`pix2deg`()	Compute gaze positions in degrees of visual angle from pixel position coordinates.
`pos2acc`(*[, degree, window_length, padding])	Compute gaze acceleration in dva/s^2 from dva position coordinates.
`pos2vel`([method])	Compute gaze velocity in dva/s from dva position coordinates.
`transform`(transform_method, **kwargs)	Apply transformation method.
`unnest`(column[, output_suffixes, output_columns])	Explode a column of type `pl.List` into one column for each list component.

Attributes

`columns`	List of column names.
`schema`	Schema of event dataframe.
`valid_acceleration_columns`
`valid_pixel_position_columns`
`valid_position_columns`
`valid_velocity_columns`