How to plot a 3d graph with z axis, not the same length as x,y

I have a matrix of values where the first column is the x data (229 rows), then the next 52 columns (also 229 rows) are the corresponding y data at different times. I am trying to plot a 3d graph where the z direction is the y data at one of the times vs the x data. Does anyone know how to do this as mesh and surf require matrixes and stem3 requires all the vectors be the same length, where currently xdata (229x1), ydata(229x1) and zdata(52x1).

Answer 1

[Walter Roberson]

Your ydata is not 229x1: it is 229x52.

You should repmat your z vector of length 52 to be 229x52.

[Fjdkrofoco]

so I would use

rNew = repmat(r, [229, 52]);

but then ydata (229x52) and rNew (229x52) are matrixes but x stays a vector (229x1)? So the dimensions wouldn't match for mesh or surf?

[Walter Roberson]

y = YourMatrix(:,2:53);
x = repmat(YourMatrix(:,1), 1, size(y,2));
special_z_index = 7;    %for example
z = repmat(y(special_z_index,:), size(y,1), 1);
surf(x, y, z, 'edgecolor', 'none')

Answer 2

[Star Strider]

Interpolation is a favourite way to ‘stretch’ vectors.

If it conforms with your other requirements, try this:

zdataNew = interp1((1:52), zdata, linspace(1, 52, numel(xdata)));

figure
plot3(xdata, ydata, zdataNew)
grid on