Cubic Spline Interpolation of a 3D surface Plot with Datetick Axis Labels

I am attempting to make a 3D surface plot of some numbers that need to have cubic spline interpolation applied to them.

The problem with this is that after doing so I need to label the x axis with a datetick format, not epoch time. Whenever I try to do this, the datetick just defaults to January 1 00:00:00. I was hoping someone could help me with this. An example of my code is below:

simulatedTime = [34630:34929, 34630:34929];
simulatedZ = 350 + 250*rand(600, 1);
simulatedY = [sort(floor(50+10*rand(300, 1))); sort(floor(100+10*rand(300, 1)))];

[xq, yq] = meshgrid(min(simulatedTime):60:max(simulatedTime),...
    min(simulatedY):1:max(simulatedY));
zq = griddata(simulatedTime, simulatedY, simulatedZ, xq, yq, 'cubic');

figure;
surf(xq, yq, zq);
xData = datetime(34630:34929, 'convertfrom','posixtime');
datetick('x','HH:MM:SS');

Thank you.

Answer 1

[Star Strider]

See if this works in your application:

simulatedTime = [34630:34929, 34630:34929];
simulatedZ = 350 + 250*rand(600, 1);
simulatedY = [sort(floor(50+10*rand(300, 1))); sort(floor(100+10*rand(300, 1)))];
[xq, yq] = meshgrid(min(simulatedTime):60:max(simulatedTime),...
    min(simulatedY):1:max(simulatedY));
zq = griddata(simulatedTime, simulatedY, simulatedZ, xq, yq, 'cubic');
figure;
surf(xq, yq, zq);
Ax = gca;
xData = cellstr(datetime(34630:34929, 'convertfrom','posixtime'));
Ax.XTickLabel = xData;

It creates a cell array with the cellstr function, then assigns those to the 'XTickLabel' object.

Experiment with it to get the result you want.

[Logan Suarez Parmer]

Thank you so much, this was exactly what I was looking for.

Just to check, am I splining the 3D data correctly? Obviously it is random data right now, but if simulatedY was kilometers and simulatedTime was seconds, this would spline and interpolate the Z axis data to the minute/kilometer, right?

[Star Strider]

As always, my pleasure.