How can I read a complex number vector?

Question

André Luiz Regis Monteiro 2014-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/115716-how-can-i-read-a-complex-number-vector

编辑： JasonLuo 2018-1-25

Hi, I have this problem. I'm trying to read a complex number vector from a txt file using this structure:

    fid=fopen ('VarName4.txt','r');
    acorrente=fscanf(fid,'%f');
    fclose (fid);

VarName4.txt is a vector 1000x1 like this:

    [0.0141451080390089-0.00224036502008852i
0141451080390089-0.00224036502008852i
0141451080390089-0.00224036502008852i
0141451080390089-0.00224036502008852i...]

Using the structure before, the answer is:

    acorrente =
        0.0141
       -0.0022

Why it doesn't work? Could someone teach me? Thanks a lot!

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José-Luis 2014-2-11

It doesn't work because you are telling fscanf to expect a floating point number. Fscanf won't read in imaginary numbers.

André Luiz Regis Monteiro 2014-2-11

Hi José-Luis. So, How can I do? thanks.

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Answer 1

Mischa Kim 2014-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/115716-how-can-i-read-a-complex-number-vector#answer_123991

编辑：Mischa Kim 2014-2-11

在 MATLAB Online 中打开

André Luiz, this should do:

fid = fopen ('VarName4.txt','r'); 
ii  = 1;
while ~feof(fid)
    acorrente(ii, :) = str2num(fgets(fid));
    ii = ii + 1;
end
fclose(fid);

...read each line of the text file, convert it from string to number and save it in the matrix. The loop will keep reading until the end of the file ( feof ) is reached.