How to plot a specific variable if condition is met

Hi,

I have code that is comparing two sensors (Ms and V). V measures both left and right, however Ms measures only the side that it is placed on. I would like to only plot the correct side of V so that it corresponds to Ms, instead of plotting both left and right of V.

I have previously read in whether the file I am workign with is the left or the right side, in order to use cross correlation to time synchronise the different sensor files, please see below.

if strcmp(sensorside{1,1},cellstr('left'))

disp('left!');

[r,lags] = xcorr(angles{1,i}.LKneeAngles(:,1),MS_knee_angle2,numrows_Vic(i)); %tried alignsignals instead of xcorr

elseif strcmp(sensorside{1,1},cellstr('right'))

disp('right!');

[r,lags] = xcorr(angles{1,i}.RKneeAngles(:,1),MS_knee_angle2,numrows_Vic(i));

else

error('Help!');

end

How would I go about plotting only the left or only the right side for the V sensor depending on what side the sensor is placed? I am not sure how to do the if loop for a figure.

%% Time synch plot for MS and Vicon _changed 19/08/2022

figure

plot(time', sync(i).V_LK);

hold on

plot(time',sync(i).V_RK);

hold on

plot(time',sync(i).MS_K);

title('Time synchronised plots comparing MS to Vicon for activity',activity);

legend('Vicon left knee', 'Vicon right knee','MotionSense');

Thank you so much for any advice

Answer 1

[Yash]

Hi Alexandra,

To plot only the correct side of the V sensor that corresponds to the side of the Ms sensor, you can modify your code as follows:

1. After determining the side of the sensor using the strcmp condition, you can create a logical index to select the appropriate side of the V sensor data.
2. Use the logical index to plot only the selected side of the V sensor data.

Here's an example of how you can modify your code:

if strcmp(sensorside{1, 1}, 'left')
    v_sensor_side = sync(i).V_LK; % Select the left side of V sensor data
    
elseif strcmp(sensorside{1, 1}, 'right')
    v_sensor_side = sync(i).V_RK; % Select the right side of V sensor data

While plotting, plot v_sensor_side only.

% Plot the selected side of the V sensor data
figure
plot(time, v_sensor_side);
hold on
plot(time, sync(i).MS_K);

In the modified code, we create a variable v_sensor_side and assign the appropriate side of the V sensor data based on the side of the Ms sensor. Then, we plot the selected side of the V sensor data along with the Ms sensor data.