Extracting points from an interpolated surface (Lowess fit)

Hey Guys,

I have made a surface using the lowess fit from a non uniform set of data points. I am only able to read points from the surface only using the interactive data cursor by manually clicking on points.

I wanted to be able to extract points on the interpolated surface feeding in the x,y coordinates and extracting the z - coordinate. Please find the code below that I'm using.

Thanks in advance,

Hamed

Ratings = xlsread('SpreadMatrixFrontEnd10.xlsx','Consumer Goods122','B2:B122');

DTM = xlsread('SpreadMatrixFrontEnd10.xlsx','Consumer Goods122','A2:A122');

Yield = xlsread('SpreadMatrixFrontEnd10.xlsx','Consumer Goods122','C2:C122');

w= xlsread('SpreadMatrixFrontEnd10.xlsx','Consumer Goods122','D2:D122');

[xInput, yInput, zOutput, weights] = prepareSurfaceData( Ratings, DTM, Yield, w );

% Set up fittype and options.

ft = fittype( 'lowess' );

opts = fitoptions( ft );

opts.Span = 0.9;

opts.Weights = weights;

opts.Normalize = 'on';

% Fit model to data.

[fitresult, gof] = fit( [xInput, yInput], zOutput, ft, opts );

% Plot fit with data.

figure( 'Name', 'Consumer Goods' );

h = plot( fitresult, [xInput, yInput], zOutput );

% Label axes

xlabel( 'Ratings' );

ylabel( 'DTM' );

zlabel( 'Yield' );

grid on

[Walter Roberson]

Please re-tag this Question. http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

Answer 1

[Teja Muppirala]

You can directly call your FIT object with the points you want to evaluate. Like this:

fitresult(3,4)

fitresult([1 2 3],[5 10 15])

[Hamed]

Thank you very much Teja!

Answer 2

[Walter Roberson]

Please re-tag this Question. http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags