Normalize values in a plot

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Miguel Albuquerque
Miguel Albuquerque on 11 Jul 2022
Hey guys, thanks in advance,
I have this graph:
And I wish to normalize y axis , saying that maximum is 0dB. Im normalizing it like this:
maxval=max(X_QPSK_cut);
X_QPSK_cut=X_QPSK_cut/maxval;
fig=figure;
hold on
set(fig,'color','white');
plot(freq_XQPSK_cut,20*log10(X_QPSK_cut),'b','linewidth',2);
xlabel('Frequency [Hz]');
ylabel('QPSK Spectrum [dB]');
set(gca,'fontsize',fontsize);
grid on;
hold off
Is there a way of normalize the y axis , saying that max val is 0, because, if I put 0 it will say that vector is infinit, and that is true,
Thanks,
  4 Comments
dpb
dpb on 12 Jul 2022
The above plot doesn't seem to represent the code (or vice versa)....if you actually normalized as the code says, the max cannot be -105 dB or whatever the max actually is on the plot.
Something's not kosher -- attach the data file as .mat file.
Miguel Albuquerque
Miguel Albuquerque on 12 Jul 2022
Thanks dpb, I ve already solved it, I normalized with the max value of the plot, the plot in the figure, increased 110 dB.

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