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Normalize values in a plot

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Miguel Albuquerque
Miguel Albuquerque el 11 de Jul. de 2022
Comentada: Miguel Albuquerque el 12 de Jul. de 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 comentarios
dpb
dpb el 12 de Jul. de 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 el 12 de Jul. de 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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R2021b

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