PLEASE HELP! How to align or adjust 4 figures showing sensor data?

Dear communuity,

I spent several days to create one figure of gyroscoe sensor data wich shows the given data in perfect overlay. Needed firues attached.

I tried xcorr() and alignsignals()from https://de.mathworks.com/help/signal/ref/alignsignals.html.

But I can't idenify my mistake in the following script or how to solve of extracting the needed data from my figures. The shown cycles (data points) in the figures schould be visualised in the new plot, too.

close all, clear all



P1= openfig('1_Ap_gz_VR_perfekt_linkehand_langeseite.fig', 'reuse');
b1 = get(gca,'Children');
c = get(b1,'Type');
b = findobj(gca,'Type','Line');
set(b,'Color',[1 0.466666666666667 0]);


xdata1= get(b1, 'XData');
ydata1 = get(b1, 'YData');
zdata1 = get(b1, 'ZData');

%hier wollte ich einen datarange auswählen von einerr fig um die synchron
%übereinander zu layern
%h = findobj(gca,'Type','line')
%x=get(h,'Xdata') ;
%y=get(h,'Ydata') ;
%(x,y) is your required data.

P2= openfig('3_Ap_gz_VR_perfekt_linkehand_langeseite.fig','reuse');
b2 = get(gca,'child');
c = get(b2,'Type');
b = findobj(gca,'Type','Line');
set(b,'Color',[0.372549019607843 0.63921568627451 0.0196078431372549]);


xdata2= get(b2, 'XData');
ydata2 = get(b2, 'YData');
zdata2 = get(b2, 'ZData');

P3= openfig('16_AP_gyro_z__VL.fig','reuse');
b3 = get(gca,'child');
c = get(b3,'Type');
b = findobj(gca,'Type','Line');
set(b,'Color',[0.494117647058824 0.184313725490196 0.556862745098039]);


xdata3= get(b3, 'XData');
ydata3 = get(b3, 'YData');
zdata3 = get(b3, 'ZData');




P4= openfig('18_AP_gyro_z__VR.fig','reuse');
b4 = get(gca,'child');
c = get(b4,'Type');
b = findobj(gca,'Type','Line');
set(b,'Color',"b");

xdata4= get(b4, 'XData');
ydata4 = get(b4, 'YData');
zdata4 = get(b4, 'ZData');








%find the optimal alignment for the simulated data
[~,idx]=max(xcorr(ydata1, ydata2, ydata3, ydata4));  %idx=index where cross correlation is maximum
t2adj=t2+idx-N;             %shift the time base for x2
 



figure
h1=axes;
Q1=copyobj(allchild(get(P1,'CurrentAxes')),h1);
hold on
Q2=copyobj(allchild(get(P2,'CurrentAxes')),h1);
hold on
Q3=copyobj(allchild(get(P3,'CurrentAxes')),h1);
hold on
Q4=copyobj(allchild(get(P4,'CurrentAxes')),h1);



%ich glaube, das hier soll die range der x-Achse definfieren, und zwar
%welche für jeden plot angezeigt wird -> funktioniert
h1.XLim = [83 84];


hL=findobj(h1,'LineStyle','-');
legend(hL,'Pferd 1 ','Pferd 3','Pferd 16', 'Pferd 18',"edgecolor","white",'Fontsize', 13);

at the moment my figure looks like that:

but it should change like this kind of example (https://de.mathworks.com/matlabcentral/answers/1888002-how-can-i-align-multiple-curves-on-one-plot-to-a-central-point)

I hope somebody can help and explain where I've made a mistake.

Answer 1

[Sulaymon Eshkabilov]

According to the figures that attached to your post without looking at your code:

initial observations are:

(1) Sensor readings (gyro) shows that some unstable reading

(2) or if your gyro sensor reading is ok, then the gyro position was changed abruptly.

(3) your data sampling rate seems in your gyro sensor to be a bit slower than it should be.

Check these issues and address them accordingly before coding.

[Belinda]

Thank you for your response, I can't change any kind of data. every figure shows movements of the same front leg of 4 different horses each.

Every test run had different procedures and so different length. But I wanted to visualize one stride of each horsee as an synchronous overlay within one or two seconds irrespective of the original timespan of start an stop of these strides

I would like to have it like this, from the sart of one stride to the end. For this I need to know how to adjust each sequence