How to remove the part of a signal less than xaxis =0 along with the peak

Hello All,

Could you please help me with the MATLAB command to remove(trim) part of the signal highlighted in red colour in the image

Answer 1

[Vishnu Vardhan]

Hi Ashwini

you can use find function available in MATLAB

idx = find(x>=0);
plot(x(idx) ,y(idx))  %where x and y are the axis

Hope that helps!

[Ashwini Amin]

Hello Vishnu,

Thank you. This code helped me to trim the data but i still see a part of the peak present as attached here.

Could you please suggest me on how to remove this. Tried below :

idx = find(xaxisdataC>=5);

plot(xaxisdataC(idx) ,yaxisdataC(idx))

but this dint generate any plot.

[Vishnu Vardhan]

Try idx = find(xaxisdataC>=0.1); depending upon where you want the plot to start.

[Ashwini Amin]

Hello Vishnu ,

I have tried

idx = find(xaxisdataC>=0.1);

plot(xaxisdataC(idx) ,yaxisdataC(idx))

While doing so it is returning idx =[] (null )in my workspace.

Else could you please suggest a way to remove the part of signal from 0 upto the peak(present around value of 1000) in below image

[Ashwini Amin]

Can i use any kind of filter or windowing techniques. If yes please help me with the code.