how to obtain the required point in the obtained fft signal and remove rest of the points in the signal

i got the code till applying fft to the signal

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/signal/ug/find-peaks-in-data.html

https://in.mathworks.com/help/signal/ref/findpeaks.html

Answer 2

[Bhuvnesh Singh]

As suggested above you can use findpeaks function to find values and locations of local maxima in a set of data.

where function findpeaks(data) returns a vector with the local maxima (peaks) of the input signal vector, data. A local peak is a data sample that is either larger than its two neighboring samples or is equal to Inf. Non-Inf signal endpoints are excluded. If a peak is flat, the function returns only the point with the lowest index.

You can follow the link for more information: https://www.mathworks.com/help/signal/ug/find-peaks-in-data.html