BUG: evaluate.SF2d fails for fields

[kay-ro]

Description:

without specifying the field in evaluate.SF2d, the evaluation will run through but return incorrect results.

Code for reproduction:

import amep
path="/home/dormann/Documents/git_amep/examples/data/continuum.h5amep"
ctraj = amep.load.traj(path)

fsf2d = amep.evaluate.SF2d(
    ctraj, nav = 1, skip = 0.9
)
fig, axs = amep.plot.new()
mp = amep.plot.field(
    axs, fsf2d.avg, fsf2d.qx, fsf2d.qy,
    cscale="log", vmin=1e0
)

fsf2d = amep.evaluate.SF2d(
    ctraj, nav = 1, skip = 0.9,
    ftype="c"
)
fig, axs = amep.plot.new()
mp = amep.plot.field(
    axs, fsf2d.avg, fsf2d.qx, fsf2d.qy,
    cscale="log", vmin=1e0
)

Error message:

Python and AMEP versions:

amep 1.1.1

Additional information:

No response

How did you install AMEP?

pip

[kay-ro]

this probably can be fixed by enforcing that the field type must be specified.