Convert data from a 3d residual plot to a matrix?

Hello,

I have created a 3d residual plot from point cloud data. How can i now export these new residual x,y,z values as a 3 column matrix to do further work with?

As you can see from the image the residual plot at the moment is visually unclear due to the large amount of data points.

Any advice would be helpful. Thanks

Joe

 %%Fit: 'Residual'.
 [xData, yData, zData] = prepareSurfaceData( Dx3, Dy4, Dz2 );

 % Set up fittype and options.
 ft = fittype( 'poly55' );
 opts = fitoptions( 'Method', 'LinearLeastSquares' );
 opts.Normalize = 'on';
 opts.Robust = 'Bisquare';

 % Fit model to data.
 [fitresult, gof] = fit( [xData, yData], zData, ft, opts);

 % Plot residuals.
 figure( 'Name', 'Residual Plot' );
 plot( fitresult, [xData, yData], zData,'Style', 'Residual');
 % Label axes
 xlabel 'x (m)'
 ylabel 'y (m)'
 zlabel 'z (m)'
 grid on
 view( 0, 90 );

Dx3,Dy4,Dz2. These are the column vectors describing the intial raw data.

The code currently plots a fit to this data. Then creates a residual plot (plotting the points again above and below the fit).

So I am trying to extract these 'residual' points as a new set of data as 3 column vectors representing x,y and z or all together in a r column matrix.

Answer 1

[Joe Pashley]

I sorted this by instead of plotting the residual. I used fitresult to extract the z data of the fitted data points. Then I subtracted the original points away from the fit. This was then into a matrix with the same width of x/y data. This gives me a mesh of the residual plot.

 %calcualte z data of fit
 fitresultZ              = fitresult(xData,yData);

 %calcualte z data of raw data - sfit z data
 Dzformremove            = Dz2 - fitresultZ;

 %plot as mesh
 Dformremovemesh         = vec2mat(Dzformremove,512);

 mesh(Dformremovemesh);

Answer 2

[madhan ravi]

    3_column_matrix = [ x(:) y(:) z(:) ]

[Joe Pashley]

Hi, sorry I couldn't get this to work. I have added more detail to my question.

[madhan ravi]

Dx3, Dy4, Dz2 ???

[Joe Pashley]

Dx3,Dy4,Dz2. These are the column vectors describing the intial raw data.

The code currently plots a fit to this data. Then creates a residual plot (plotting the points again above and below the fit).

So I am trying to extract these 'residual' points as a new set of data as 3 column vectors representing x,y and z or all together in a r column matrix.

[madhan ravi]

Can you upload the data’s of Dx3 and the other two so that we can test??

[Joe Pashley]

Sure I can, but the data is rather large though each is a 262,144 column vector. I have attached my code and an excel file that the code reads which contains the raw data.

My end goal is to turn the residual data into some kind of contour plot or 3d scatter plot.

[madhan ravi]

We have to wait for someone who can proceed further , im finding it difficult to interpret