I plotted my pwelch, and I want the frequency at which the graph shows the highest value. In this particular case its around .25. I tried using findpeaks but it gives me some weird answer.
You can obtain the frequency and power vectors from pwelch function. Example;
fs = 1e3; t = 0:1/fs:1-1/fs; x = sin(2*pi*100*t); [pxx,f] = pwelch(x,500,300,500,fs); plot(f,20*log10(pxx))
then, you can simple do the following to find the frequency corresponding to max peak;
index = find(pxx == max(pxx)); freq_max = f(index); % frequency at which pxx is maximum