Surface Fitting only in Z Direction

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Jasnoor Singh
Jasnoor Singh 2016-5-19
评论： Jasnoor Singh 2016-5-19
I have a 44 by 44 square grid and I have a pressure value specified in the Z direction at each intersection point in the grid. So basically 44 x 44 = 1936 pressure values. I am able to plot a surface for these pressure values but the surface has many peaks. In what way can I smooth the surface? I cannot use cftool since I need to do this for multiple grids. How can I do this automatically by writing a code? I tried using the following syntax:
fitobject = fit([x,y],z,fitType)
But I only want to smooth the surface in Z direction, x and y are distances in space and hence need to be constant. How can I do this?

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回答（1 个）

John D'Errico
John D'Errico 2016-5-19
But you just have a regular grid in x,y. So just use conv2, with a Gaussian blur kernel. Simple to do. Fast. Easy. No need to do any curve or surface fitting.
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Jasnoor Singh
Jasnoor Singh 2016-5-19
I'm not very familiar with the functions of matlab since I am new to the software. Could you please tell me how to use this function?
For your reference, following is my code so far:
x = 1:44;
y = 1:44;
for i = 1:5
a = xlsread('\\uoa.auckland.ac.nz\engdfs\air.xlsx',strcat('CO',int2str(46*i-18),':','EF',int2str(46*i+25)));
figure;
surf(x,y,a);
axis([0 44 0 44 -50 120]);
fname = sprintf('A%d.png',i);
saveas(gcf,fname);
end

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