function of source

    patch: Patch ,
    copy = False,
    relative = False,
    **kwargs ,
)-> ‘PatchType’

Return a subset of the patch using value-based query parameters.

Any dimension of the data can be passed as key, and the values should either be a Slice or a tuple of (min, max) for that dimension. None and … both indicate open intervals.

The time dimension is handled specially in that either floats, datetime64 or datetime objects can be used to specify relative or absolute times, respectively.


Parameter Description
patch The patch object.
copy If True, copy the resulting data. This is needed so the old array can get gc’ed and memory freed.
relative If True, select ranges are relative to the start of coordinate, if possitive, or the end of the coordinate, if negative.
**kwargs Used to specify the dimension and slices to select on.
See also iselect.


import numpy as np
import dascore as dc
from dascore.examples import get_example_patch
patch = get_example_patch()
# select meters 50 to 300
new_distance =, 300))
# select channels less than 300
lt_dist =, 300))
# select time (1 second from start to -1 second from end)
t1 = patch.attrs.time_min + dc.to_timedelta64(1)
t2 = patch.attrs.time_max - dc.to_timedelta64(1)
new_time1 =, t2))
# this can be accomplished more simply using the relative keyword
new_time2 =, -1), relative=True)
# filter 1 second from start time to 3 seconds from start time
new_time3 =, 3), relative=True)
# filter 6 second from end time to 1 second from end time
new_time4 =, -1), relative=True)