How to write a code for the following condition ??

I have an fft graph which has peak say 50(amplitude). I have to ignore all other amplitudes which are less than 25 and should consider only those signals which has amplitude greater than 25.

[Geoff Hayes]

Mounika - do you have a vector/array that is the result of the FFT that you have determined has a peak of 50? How have you determined that value? Because you can use the same logic to determine which other frequencies have an amplitude greater than 25. Please post some of the code that you have written so that we can advise you on what to do next.