how does fprintf function work?

Question

Mahmoud 2014-1-10

评论： Mahmoud 2014-1-10

I have prepared a code that outputs a string that has a value depends in values result from my code. initially, it works with the following code:

fprintf('Arrhythmia was detected at t= %s \n',t(R_loc(i+1)))

and the output, for example, was: Arrhythmia was detected at t=9.550000e+00

I need the result as : Arrhythmia was detected at t=9.55 (without e+00)

another issue, I used this code:

Heart_Rate = length(R_loc)/(length(t)/fs)*60
fprintf('The heart rate = %s \n' , Heart_Rate)

and the result is : Heart_Rate =

54

The heart rate = 6

Why does this happen?

thanks ..

Answer 1

Image Analyst 2014-1-10

%s is for strings. For a fractional number, use %f:

fprintf('The heart rate = %.3f\n' , Heart_Rate); % 3 decimal places.

Mahmoud 2014-1-10

Thank you a lot :)