MATLAB: How to avoid truncation and loss of precision when saving the data in MATLAB

asciibinarydatalossMATLABprecisionsavesavingtruncation

I have tried saving my data with SAVE -ASCII (or FPRINTF, DLMWRITE, etc.) and notice that I lose precision when I do this.

To obtain 16-digit ASCII format using the SAVE function, use the following command:

save -ascii -double

Following is an example of writing "pi" to a TXT-file with double precision using DLMWRITE:

dlmwrite('myfile1.txt', pi, 'delimiter', '\t', 'precision', 16)

For more information on precision specification, refer the respective documentation pages by executing the following MATLAB commands:

doc save
doc dlmwrite

Information on C-style format string allowed in DLMWRITE can be found here:

doc sprintf

You cannot have multiple "precision" arguments in dlmwrite()

Let x be your symbolic variable.

fid = fopen('test.txt', 'wt');
fprintf(fid, '%s\n', char(x));
fclose(fid);