pulsarbat.Signal#
- class pulsarbat.Signal(z, /, *, sample_rate, start_time=None, meta=None)[source]#
Base class for all signals.
A signal is sufficiently described by an array of samples (
z
), and a sampling rate (sample_rate
). Optionally, astart_time
can be provided to specify the time stamp at the first sample of the signal.The signal data (
z
) must have at least 1 dimension where the zeroth axis (axis=0
) refers to time. That is,z[i]
is thei
-th sample of the signal, and the sample shape (z[i].shape
) can be arbitrary.- Parameters:
- zarray-like
The signal data. Must be at least 1-dimensional with shape
(nsample, ...)
, and must have non-zero size.- sample_rate
Quantity
The number of samples per second. Must be in units of frequency.
- start_time
Time
, optional The start time of the signal (that is, the time at the first sample of the signal).
- meta
dict
, optional Any metadata that the user might want to attach to the signal.
Attributes
axes_labels
Dictionary of axes labels.
data
The signal data.
dt
Sample spacing of the signal (
1 / sample_rate
).dtype
Data type of the signal.
meta
Signal metadata.
ndim
Number of dimensions in data.
sample_rate
Sample rate of the signal.
sample_shape
Shape of a sample.
shape
Shape of the signal.
start_time
Start time of the signal (Time at first sample).
stop_time
Stop time of the signal (Time at sample after the last sample).
time_length
Length of signal in time units.
Methods
compute
(**kwargs)Returns signal with computed data.
contains
(t, /)Whether time(s) are within the bounds of the signal.
get_axis
(axis)Axis number from an integer or axis label.
like
(obj[, z])Returns a signal object "like" given signal object.
persist
(**kwargs)Returns signal with data persisted in memory.
rechunk
([chunks])Rechunks signal data if stored as a Dask array.
Returns signal with data as a Dask array.
- compute(**kwargs)[source]#
Returns signal with computed data.
Has no effect unless data is stored as a Dask Array.
kwargs
are passed on to thedask.compute()
function.
- classmethod like(obj, z=None, /, **kwargs)[source]#
Returns a signal object “like” given signal object.
This classmethod inspects the class signature and creates a signal object like the given reference object. The signal data (as an array) must always be provided as well as any other arguments that are intended to be different than the reference object. All arguments required by the class signature that are not provided are acquired from attributes of the same name in the reference object.
- Parameters:
- obj
Signal
The reference signal object.
- zarray-like
The signal data.
- **kwargs
Additional keyword arguments to pass on to the target class.
- obj
- persist(**kwargs)[source]#
Returns signal with data persisted in memory.
Has no effect unless data is stored as a Dask Array.
kwargs
are passed on to thedask.persist()
function.
- rechunk(chunks=None, **kwargs)[source]#
Rechunks signal data if stored as a Dask array.
If the underlying data is not a Dask array, it is converted to one first. By default, there is no chunking along the first dimension and other dimensions are automatically chunked based on the default chunk size set in Dask’s configuration.
kwargs
are passed along todask.array.rechunk()
.
- to_dask_array()[source]#
Returns signal with data as a Dask array.
Uses
dask.array.asanyarray()
to convert signal data to a Dask array.