How to i convert complex single into complex double?

I need dataset in complex double form to test the pretrained model. but when i prepare the dataset it is saved in the complex sigle from. i have attached the .mat file for furter proceding.

Answer 1

[KSSV]

Read about the function double.

If x is your single signal.

x_double = double(x) ;

Answer 2

[Chunru]

frame = single(3+4i);
% Convert to double
frame = double(frame)

frame = 3.0000 + 4.0000i

class(frame)

ans = 'double'

[Faheem Ur Rehman]

Thank you