fprintf( '%s', my_str );

>>disp string  %command format for single string arguments
string
>>disp 'string test'
string test
>>disp ('string test') %function format
string test

>> test= 'string';
>> disp(test)
string

>>disp string test
Error using disp
Too many input arguments.

>> a = 'string';
>> a

a =

string