Questions and issues with csi matrix

[Jaesuru]

Hello! I am completely new to the topic of CSI and trying to extract it for using it with detecting human poses, and etc. I've obtained a .pcap file type from extracting it on a Raspberry Pi using Nexmon's tool, and I just now need to use CSIKit to parse that data and obtain the CSI matrix. However, when I ran the code with Python and turned it into the format of a .mat file, all the values in the matrix table were negative numbers and doubles. I was told that I am supposed to receive complex doubles and a mix of positive/negative numbers. How do I solve this issue? My code is down below here that I've did some changes on to convert into .mat

from CSIKit.reader import get_reader
from CSIKit.util import csitools
import scipy.io as sio

pcap_file = "path/to/file.pcap"

my_reader = get_reader(pcap_file)

csi_data = my_reader.read_file(pcap_file, scaled=True)

csi_matrix, no_frames, no_subcarriers = csitools.get_CSI(csi_data)

data_for_matlab = {
'csi_matrix': csi_matrix,
'no_frames': no_frames,
'no_subcarriers': no_subcarriers
}

mat_file = "path/to/file.pcap"
sio.savemat(mat_file, data_for_matlab)

Help with this would be greatly appreciated.