How to read the result of fprintf

I have the following code line:

fprintf('set %d\n', ID);

That ID is not directly accessible to me, so I can't simply use it. However, if I find such text file I am able to use its content.

So, where can I find a text file with the data (1) and how can I read that ID (2)?

For example,

assignin('base', 'id', ID);

works perfect for my purposes. So I hope it is possible to use similar approach for fprintf.

[Voss]

Please post some example code to show what you mean.

[Adam Danz]

fprintf doesn't write to a variable. It writes to a file or the command winodw. Are you thinking of sprintf?

[Dmytro Sokol]

Sorry for the confusion. I've provided a more correct statement of the problem.

Answer 1

[Walter Roberson]

See evalc() or sometimes diary()

But you would typically be better off using sprintf or compose

[Dmytro Sokol]

Unfortunately, I am not able to replace fprintf with smth else

[Walter Roberson]

output = evalc("simout = sim('model', appropriate parameters);");

Answer 2

[Steven Lord]

ID = 42;
fprintf('set %d\n', ID);

set 42

When called with that syntax, fprintf does not write to a file. It writes to the Command Window. Unless you're already capturing the Command Window output using diary or the -logfile startup option or something similar or if you have a pair of fprintf calls (one that displays to the Command Window and one that writes to a file) you can't retrieve that information automatically.

[Dmytro Sokol]

Makes sense. And what if fprintf is a part of a function which is used in a Simulink model?

[Walter Roberson]

@Dmytro Sokol

evalc

[Steven Lord]

Where does ID come from in that case? Is it stored in a model workspace? Is it an output from the function block that you can send to a To Workspace block? Does it come into the function block from another block (which can be connected to a To Workspace block?)

Answer 3

[Image Analyst]

The result of that fprintf() would be a line printed to the command window. Because you did not provide a file handle as the first argument to fprintf(), that means it will go to the command window instead of to a file on disk. ID must somehow be a variable that is visible to the function where you are calling fprintf(). Like

ID = 123;
fprintf('set %d\n', ID); % Display "set 123" in the command window.

Like Steve said.

" if I find such text file" <=== I have no idea what text file you are referring to.

And I have no idea how to use Simulink.