I was able to do something similar but had to change your code slightly
% use 's' to indicate that the result is a string and not an
% expression that should not be evaluated
savename = input('name : ', 's');
% open the file
f=fopen(savename,'w');
% write a line to print out a statement
fprintf(f,'fprintf(''this is a test\\n'');');
% close the file
fclose(f);
% use savename rather than save_name
run(save name);
And this worked fine with the output being
this is a test
and the input being test.m.
What are you writing to your m file? If you run this script from the Command Window, does it work or does it only fail when you try to call it from the other m file (as above)?
