non-integer tpow breaks fk migration

[seanbemis]

I installed GPRPy in a conda environment using python 3.12.4. I've been testing out a number of processing sequences to get a well-gained radargram and I'm quite happy with a tpow of 1.5. However, when I run the fk migration after a tpow = 1.5, the profile display comes up blank. The terminal has come up a couple different errors when this happens. Here is the last error I was presented with:

C:\Users\xxxxxx\anaconda3\envs\gprpy_env\Lib\site-packages\gprpy\toolbox\gprpyTools.py:249: RuntimeWarning: invalid value encountered in power
factor = np.reshape(twtt**(float(power)),(len(twtt),1))
8192it [00:00, 15318.82it/s]
C:\Users\xxxxxx\anaconda3\envs\gprpy_env\Lib\site-packages\gprpy\gprpyGUI.py:783: RuntimeWarning: All-NaN slice encountered
stdcont = np.nanmax(np.abs(proj.data)[:])

Now, the fk migration works fine every time I try it if I don't apply a tpow gain. But, after quite a bit of testing, I discovered that the fk migration does work if I use a tpow value of 1 or 2 - so it seems that decimal point tpow values appears to be causing a problem in my setup of GPRPy.

Is this a python version issue? Any other ideas? Thanks!