Matlab 3d Surface Plot From Scatter Data

The surface plot uses z for height and co for color.

Matlab 3d surface plot from scatter data. The first page of the array indicates the red component for each color the second page indicates the green component and the third page indicates the blue component. Simply doing a 3d scatter plot is messy looking. I cant use surf because im working in spherical coordinates and thus each data point must be preserved as a triplet of points as one cant just convert from spherical triplets to the rectangular ix1 x vector jx1 y vector ixj z matrix that surf requires. Create a 3 d scatter plot and use view to change the angle of the axes in the figure.

3d plot scattered data of closed surface. Real data is not always on a nice xy grid but the matlab commands surf and mesh expect them to be. Specify the colors using truecolor which uses triplets of numbers to stand for all possible colors. Id like a surface.

Figure scatter3 xyzsc view 4035 corresponding entries in x y z and c determine the location and color of each marker. When you use truecolor if z is m by n then co is m by n by 3. Specify the colors for a surface plot by including a fourth matrix input co. 3d plot in matlab data analysis and visualization duration.

Matlab has a number of methods for interpolating data both for data that is sampled on a regular grid and for data that is scattered or randomly distributed. Using delaunay is what griddata does. Learn more about 3d scatter surface closed. Its only okay for 2d data but very slow for 3d data z will be an individual dimension instead of a value of fxy in 3d data situation.

Plotting surfaces over grid points is easy using matlabs surf command and interpolation of that data to get smoother plots is straightforward. Two minute video shows how to fit a surface to nonuniform data. Griddata and meshgrid help to fix this. Podcast here other video.

Vq griddataxyvxqyq fits a surface of the form v fxy to the scattered data in the vectors xyvthe griddata function interpolates the surface at the query points specified by xqyq and returns the interpolated values vqthe surface always passes through the data points defined by x and y.