How can the generated complex numbers represented by j instead of i?

I need to import data into python. However, imaginary number does not use i in python

[Stephen23]

You can save the data in a .mat file and then use numpy/scipy loadmat.

[Lz Lu]

Sorry,I first need to import the data into a csv file before I can proceed to the next step

Answer 1

[the cyclist]

If z is your complex variable in MATLAB, save the real part

real(z)

and the imaginary part

imag(z)

separately, and re-construct them in python.

Answer 2

[Jason Ellison]

Hi!

I had this problem recently too. I fixed it in Python instead of MATLAB. Here is my solution.

# this one imports a csv and compares it to the output of the function above. This is quite painful in python.

# First, you need to open the file and read the lines into a variable.

with open('./csv_files/S2_M12_transmissionFrom1x_shiftn3_lfl2_rfl2_alpha0p5_matlab.csv') as f:

lines = f.readlines()

# initialize array

known = zeros((len(lines),), dtype='complex')

# then, in a loop, you need to

k = 0 # this will index the known array

for line in lines:

# 1. find where the 'i' character is.

m = re.search('i', line)

n = m.span()

# 2. replace 'i' with 'j'

number_in_string = line[0:n[0]]+'j'

# 3. convert to complex and put it in an array

known[k] = complex(number_in_string)

k = k+1

[Jason Ellison]

I have an alternative answer in MATLAB as well ...

fid = fopen("filename.csv", 'w');
n = length(data);
for i = 1:n
    if i~=n
        % write all but the last line like this
        fprintf(fid, '%d+%dj,',real(data(i)), imag(data(i)));
    else
        % on the last line, don't put a comma
        fprintf(fid, '%d+%dj',real(data(i)), imag(data(i)));
    end
end
fclose(fid);