MATLAB: Scatter3 plot with intensity matrix

conversionMATLABscatter3

Hello,

I am currently having problems 3D plotting a matrix of intesity values in MATLAB. The scatter3() funciton only takes x y and z vektors. The mesh() funciton works but I need a solution where only the measurement-points are displayed and no connecting lines or surfaces!

So essentially I need a funciton that can plot the points of a 2D-intensity-matrix or can atleast convert them into a x y z coordinate format.

I am positive there is an easy way to do this, I just can't remember…

Help is very much appreciated!

Cheers, Nils

Best Answer

The function I was looking for is prepareSurfaceData()

For my example it it was [xData, yData, zData] = prepareSurfaceData( 1:1280, 1:960, intensity_data );

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If, in the auto-generated code from the gui you specify h (the handler to the plots) as an aditional output variable you can access those data.

    function [fitresult, gof, h] = createFit(x, y, z)
    %CREATEFIT(X,Y,Z)
    %  Create a fit.
    %


    %  Data for 'untitled fit 1' fit:
    %      X Input : x
    %      Y Input : y
    %      Z Output: z
    %  Output:
    %      fitresult : a fit object representing the fit.
    %      gof : structure with goodness-of fit info.
    %
    %  See also FIT, CFIT, SFIT.
    %  Auto-generated by MATLAB on 28-Apr-2017 12:52:15
    %%Fit: 'untitled fit 1'.
    [xData, yData, zData] = prepareSurfaceData( x, y, z );
    % Set up fittype and options.
    ft = fittype( 'lowess' );
    % Fit model to data.
    [fitresult, gof] = fit( [xData, yData], zData, ft, 'Normalize', 'on' );
    % Make contour plot.
    figure( 'Name', 'untitled fit 1' );
    h = plot( fitresult, [xData, yData], zData, 'Style', 'Contour' );
    legend( h, 'untitled fit 1', 'z vs. x, y', 'Location', 'NorthEast' );
    % Label axes
    xlabel x
    ylabel y
    grid on

h is an array and you have to guess which component is the one for the contour plot. In my example it was h(1). That component is the same as in [C, h] = contour(...), and you can use it in the same way. h(1).ContourMatrix has the matrix C that contour would output, and, in particular you can write

clabel(h(1).ContourMatrix, h(1))

to have the contour lines of your plot labelled.

Best Answer

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