How can I save a plot made using pwelch (power spectral density) command

So, I'm using this command to generate a power spectral density plot:

pwelch(a(1:1843200),hanning(1024*8),0,1024*8,512);

but this returns a window and I was wondering if I could write another line of code which is going to save this image automatically.

Furthermore, when I set

X= pwelch(a(1:1843200),hanning(1024*8),0,1024*8,512);

and do plot(x) it does not give me the plot with power and frequency on the axis. Is there a way of solving that?

Any help will be appreciated guys!

Answer 1

[Walter Roberson]

[X, f] = pwelch(a(1:1843200),hanning(1024*8),0,1024*8,512);
plot(f, 10*log10(X));
xlabel('Frequency (Hz)')
ylabel('Magnitude (dB)')

saveas(gcf, 'MyPwelch.jpg');