Use interact() with Short-Cadence Data

Problem description

When attempting to use intereact() on short-cadence TPF file, a RunTimeError comes up due to having more than 20,000 cadences.

Example

from lightkurve import KeplerTargetPixelFile
tpf=KeplerTargetPixelFile("ktwo212460519-c17_spd-targ.fits")
tpf.pipeline_mask
tpf.interact()

 BokehJS 0.12.16 successfully loaded.
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-141-79d3753be6aa> in <module>()
      4 tpf=KeplerTargetPixelFile("ktwo212460519-c17_spd-targ.fits")
      5 tpf.pipeline_mask
----> 6 tpf.interact()
      7 

/home/jeff/anaconda2/lib/python2.7/site-packages/lightkurve/targetpixelfile.pyc in interact(self, lc)
    459         # https://github.com/bokeh/bokeh/issues/7490
    460         if len(lc.cadenceno) > 30000:
--> 461             raise RuntimeError('Interact cannot display more than 20000 cadences.')
    462 
    463         # Map cadence to index for quick array slicing.

RuntimeError: Interact cannot display more than 20000 cadences.

Expected behavior

Ideally either a TPF could be trimmed to only include a certain cadence or time range, or interact() could have a variable that controls only including every Nth data point, or intereact() could have a cadence or time range as an input. Any of these options could get cadences < 20000 to allow interact() to work and perform smoothly.

Environment:

• Linx
• 1.0b9
• pip

[gully]

I’m going to close this issue since Short Cadence interact is now possible, albeit with some loss of the “big picture”. If anyone out there wants a range slider for interactively defining the short cadence data window size, please open an issue requesting this feature.

Note that this slicing should work for both Kepler/K2 and TESS data! Enjoy!

[gully]

The new .interact() tool that is about to be released ( #216 ) does not support short cadence yet. The next step for interact is to add a module that detects whether the input TargetPixelFile is short cadence and, if so, adds a slider like the one @nattieg made at cool stars. Using bokeh widgets makes this task much easier now, so I am confident we will be able to resolve this issue soon.