Trying to change plot style

%Plot of entire patient one time series

load ('glucose.mat')

glucose_mgdl = glucose * 18;

plot(date1+time,glucose_mgdl), 
xlabel('Days'), ylabel('Glucose')
title('Glucose readings vs days/time')

M = mean(glucose_mgdl)

M = 183.4936

S = std(glucose_mgdl)

S = 87.6448

Trying to display correlogram as the picture seen below what do I have to add to my code:

%Plot of correlogram
[r,lags] = xcorr(glucose_mgdl,'coeff');
figure
plot(lags, r, '.')

grid
xlabel('Lags')
ylabel('Croorelation Coefficient')
title('Autocorrelation')

Answer 1

[Star Strider]

‘Trying to display correlogram as the picture seen below what do I have to add to my code:’

The plot in the documentation is a stem plot. I plotted that originally, however the data are so densely packed that it simply appears as a filled area below the curve (even when using '.' as the marker).

One option would be to select a subset of values and plot them —

%Plot of entire patient one time series

T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/838945/glucose.csv');

glucose = T1.glucose;
date_time = T1.date + T1.time;

glucose_mgdl = glucose * 18;

plot(date_time,glucose_mgdl), 
xlabel('Days'), ylabel('Glucose')
title('Glucose readings vs days/time')

M = mean(glucose_mgdl)

M = 183.4936

S = std(glucose_mgdl)

S = 87.6448

%Plot of correlogram
[r,lags] = xcorr(glucose_mgdl,'coeff');

sampstep = 10;                                          % Sampling Step
rs = r(1:sampstep:end);
lagss = lags(1:sampstep:end);

figure
stem(lagss, rs, '.')

grid
xlabel('Lags')
ylabel('Crorelation Coefficient')
title('Autocorrelation')

Change the value of ‘sampstep’ to get different stem plot results.

.

[Nathaniel Porter]

Oh okay thank you

[Star Strider]

As always, my pleasure!

.