Error Using fprintf Invalid file identifier. Use fopen to generate a valid file identifier.

Hello,

I have this script.

I = (kron(ev1_of_alice,(ev1_of_bob+ev2_of_bob)))+kron(ev2_of_alice,(ev1_of_bob-ev2_of_bob));
if ~isnan(I)
  fprintf("I = "+ I + "\n");
  if abs(I)>2
  fprintf("Violated Bell Inequality");
  end
else
  fprintf("Not enough data to determine S\n")
end         

And when I run the script I have this error:

 Error Using fprintf Invalid file identifier.  Use fopen to generate a valid file identifier.

But I dont understand anything I is not a file I am trying to write a value not a file. How can I solve it?

Answer 1

[the cyclist]

Is this good enough?

I = rand(2);

if ~isnan(I)
    I
if abs(I)>2
  fprintf("Violated Bell Inequality");
  end
else
  fprintf("Not enough data to determine S\n")
end

Answer 2

[madhan ravi]

"I = "+ I + "\n" % without fprintf(...)

[the cyclist]

Because of the error OP is getting, I'm pretty sure that the variable I is a numeric array, so this method probably doesn't really display what is wanted.

[madhan ravi]

I figured it out, was waiting for his response.

[Gözde Üstün]

Thank you very much. Yeah I was the numeric array