Error while using writematrix to save complex values in a .txt

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Ragini Bakshi
Ragini Bakshi 2019-12-4
评论： marmite 2025-3-24
Hello, I have a very basic script that reads in around 15000 complex values from a .csv file, does some basic data manipulation and saves it into a .txt file using writematrix. However, it seems the values with a negative imaginary component (i.e. in the form of a-bi) are being saved into the .txt as a+-bi. Calling a readmatrix on this file saves these values as NaN and I cannot proceed. Any ideas? A segment of the code follows along with the exported file values.
%% 1. .csv file to table to array
%% 2-4: Modify values by basic division, rss, etc
%% 5. Export data
writematrix(signal_d_prime, 'signal_modified.txt', 'Delimiter', ' ')
%% Check
readmatrix('signal_modified.txt')
signal mod.JPG

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Jeremy
Jeremy 2019-12-4
编辑：Jeremy 2019-12-4
csvwrite
Does this correctly. I will look into writematrix
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Jeremy
Jeremy 2021-5-26
编辑：Jeremy 2021-5-26
What version of MATLAB are you using? The issue with writematrix described in this post was fixed in R2020b. If you are using an older version I would recommend updating. If you are using a recent version and still running into an issue I would recommend making a separate question post.
XYC
XYC 2022-1-9
Hello Jeremy, I have the same problem when I call writematrix to write the matrix into a txt file and I use R2021a, any solution to this?

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Kristijan
Kristijan 2024-9-25
I had the same problem with strange negitiated imaginary values. The writematrix function seems the work , but if you put an transpose a complex vector the imaginary part gets negotiated. The result is then saved with this reverted imaginary value. For example complex vector xvec. When u save the with writematrix(xvec',"matrix.txt") the stored values have negative complex entries.
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marmite
marmite 2025-3-24
The single quotation mark operator actually does a conjugate transpose, so your observed behaviour is expected.

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