For your two alternative ways of saving this data into a text file, try the following two options. Please read the documentation for fprintf which gives you full control over how your data is written to the file. save is not a very good way to save data to a text file, especially if you care about the format of the resulting file.
Option 1:
fp = fopen('A.dat', 'wt');
fprintf(fp, '%3d', A)
fclose(fp)
Option 2:
fp = fopen('A.dat', 'wt');
fprintf(fp, '%6.2f', A)
fclose(fp)
