Surface Fitting only in Z Direction

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?

Answer 1

[John D'Errico]

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.

[Jasnoor Singh]

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