Add option of padding zero

[vsilwal]

pytomo3d/pytomo3d/signal/process.py

Line 56 in 77efedf

trace.trim(cut_starttime, cut_endtime)

It might be good to have the option of padding zeroes here. One example were this would be beneficial would be when filtering specfem synthetics (that start from time=0) for near-field stations.

[wjlei1990]

Good point!

Are you talking about something like this

I think I originally may think out that, but I realized there are 4 cases that I have to handle, which might lead me to give up code it up.

1. cut start time < trace start time
2. cut start time >= trace start time
3. cut end time < trace end time
4. cut end time >= trace end time

[vsilwal]

Great to see its already there.

Wouldn't trace.trim(cut_starttime, cut_endtime, pad=True, fill_value=0) take care of this?

For (1. start time < trace start time) and (4. end time >= trace end time) that would pad zero, and
for (2. start time >= trace start time) and (3. end time < trace end time) it would cut.

Thanks,