To convert a string variable like b'\xfd\xfd\xfd\xfd\xfd' into a row vector of integers, you can use the typecast function in MATLAB. This function allows you to convert variables to a different data type, in this case to an array of unsigned 8-bit integers.
Here is an example of how you can use the typecast function to convert the string variable to a row vector:
% Define the string variable
string_variable = b'\xfd\xfd\xfd\xfd\xfd';
% Convert the string variable to an array of unsigned 8-bit integers
row_vector = typecast(string_variable, 'uint8');
% Print the result
disp(row_vector)