Customize the x-axis of hht plot

For the following hht plot, I want to customize datetime values for 501 data points in x-axis instead of default time values. The datetime values should start from 01-01-1995.

t = 0:0.01:5;

signal = sin(2*pi*2*t) + sin(2*pi*5*t) + randn(size(t));

imf = emd(signal);

% Plot HHT spectrum

hht(imf, 1/mean(diff(t)), 'FrequencyLimits', [0 5]);

% Customize plot labels and title

xlabel('Time');

ylabel('Frequency (Hz)');

title('Hilbert-Huang Transform (HHT) Spectrum');

Answer 1

[Star Strider]

Putting 501 datetime x-ticks would be impossible to read, at least with this example. This creates all of them, nowever only uses 24 for obvious reasons.

Make appropriate changes to use the ones you want —

t = 0:0.01:5;
signal = sin(2*pi*2*t) + sin(2*pi*5*t) + randn(size(t));

imf = emd(signal);

% Plot HHT spectrum
hht(imf, 1/mean(diff(t)), 'FrequencyLimits', [0 5]);

Ax = gca;
xt = Ax.XTick;
N = 501;
xtime = linspace(min(xt), max(xt), N);
DT = datetime(1995,1,1) + years(xtime);
DT.Format = 'dd-MMM-yyyy';
xtnew = linspace(min(xt), max(xt), numel(xt)*4);
xtlnew = linspace(min(DT), max(DT), numel(xt)*4);
Ax.XTick = xtnew;
Ax.XTickLabel = compose('%s',xtlnew);
% Customize plot labels and title
xlabel('Time');
ylabel('Frequency (Hz)');
title('Hilbert-Huang Transform (HHT) Spectrum');

.

[Sujata Dhar]

Thank you.

[Star Strider]

As always, my pleasure!