MATLAB: How does fprintf function work

fprintf string

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 =

The heart rate = 6

Why does this happen?

thanks ..

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

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

Convert the R-R intervals into individual rates, then calculate the mean.

Example —

RR_Vct = rand(15,1);                        % R-R Intervals In Seconds
HR_Mean = mean(1./RR_Vct);                  % Mean Heart Rate

Please declare all variables like wh_1, wh_3 and set them to 0 at the beginning of your code. It should work fine.

And for specifiying conditions, you can also try like

if(table(n,m) >=0 && table(n, m)<=1)
    wh_1 = wh_1+1;
elseif(table(n, m)<=2 && table(n, m)<=3)
    wh_3=wh_3+1;

and so on.