Is there a command that writes code in another program?

I need to have a program that writes another program based on user input.

All I need is a command thats writes code, like:

writecode(code,program_name,line);

example:

writecode('disp(x+variable^2)','program.m',24);

I have not been able to find any command to help me do this and I am not sure if one exists.

Answer 1

[Image Analyst]

fprintf() will do that.

fid = fopen('program.m', 'wt'); % Open the file for writing.
fprintf(fid, 'disp(x+variable^2)'); % Write your line of code.
fclose(fid); % Close the file.

[Thomas Nicklaus]

Thank you very much!

[Thomas Nicklaus]

Ok, I tried it and it works, but it only writes on the first line. How do I make it write on the second line?

[Steven Lord]

Make sure that you write a newline to the file, either by calling fprintf to print what's returned by newline or by including \n in your format specifier:

fprintf('abc%cdef\nghi', newline)

The prompt will be printed right next to the i on the last line, since we didn't end that with a \n. I printed to the Command Window since I didn't specify a file identifier, but it works the same writing to a text file.

[Thomas Nicklaus]

Ok, thanks that works.