Calculate area from a signal
4 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Julio Martín
el 10 de Feb. de 2022
Editada: Julio Martín
el 13 de Feb. de 2022
Hi, would like to calculate area from this emg signal
There are three different channels. I've done RMS and snap the exact tiem I need to analyse but don't know how to calculate total area
My code is:
for c=2:2
A=strcat('S1_',num2str(c));
B=strcat(A,'.emt');
D=importdata(B,'\t',12);
[F, C]=size(D.data);
x=filter(Filtro_emg,D.data);
centro=(F-mod(F,2))/2;
x=x(((centro-4000)+242:(centro-4000)+3026),:);
RMS = Rms_emg (x,100)*1000;
S=smoothdata(RMS);
plot(S);
for b=3:5
Areatotal(b,c)=sum(S(:,b)); I've tried with this, but don't know if it's correct
Media(b,c)=mean(S(:,b));
Maximo(b,c)=max(S(:,b));
end
end
Please help, thanks!
0 comentarios
Respuesta aceptada
AndresVar
el 10 de Feb. de 2022
Editada: AndresVar
el 10 de Feb. de 2022
You can use trapezoidal rule: see trapz: Trapezoidal numerical integration - MATLAB trapz (mathworks.com)
area = trapz(x,y) % i think for you trapz(S(:,b)) or just trapz(S(:,b)) if dx = 1
sum also works so you can compare your result. You must multiply the sum by dx, but it looks like dx=1 in your case.
3 comentarios
Más respuestas (0)
Ver también
Categorías
Más información sobre Numerical Integration and Differentiation en Help Center y File Exchange.
Productos
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!