MATLAB: I can’t display all the decimal digits in a plot

plottingstring to double

My code converts a 2-columns string array (first image) into a 2-columns double array. After the conversion, the numbers in the matrix are cut off after the 4th decimal digits (second image) (I need 6 decimal digits) and if I plot the data, only the time axis values are cut off, this time after the 2nd decimal digit! (third figure) while the y axis data have all the 6 decimal digits required. How is it possible ?

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format long

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MATLAB: How to reduce the number of digits after the decimal point

To control how numbers are displayed in the Variable Viewer, you can set the format in the Preferences:

Home tab, in the Environment section, click Preferences. Select MATLAB > Variables.

https://www.mathworks.com/help/matlab/matlab_env/set-workspace-and-variable-preferences.html

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temp = strcat(cellstr(HHMMSS), {'; '}, X2);
fid = fopen('file_name.txt', 'wt');
fprintf(fid, '%s\n', temp{:});
fclose(fid)

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MATLAB: How to reduce the number of digits after the decimal point

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