plotting three column vectors (lat,long,temp) on a contour plot

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Catherine F 2016-9-6

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https://ww2.mathworks.cn/matlabcentral/answers/302129-plotting-three-column-vectors-lat-long-temp-on-a-contour-plot

评论： KSSV 2016-9-7

I have three column vectors (lat,long,temp) referred to as F(:,1) F(:,2) and F(:,3). I would like to make a contour plot. I process the data:

if true
  % code
end
x = F(:,1);
y = F(:,2);
z = F(:,3);
xi=linspace(min(x),max(x),30)
yi=linspace(min(y),max(y),30)
[XI YI]=meshgrid(xi,yi);
ZI = griddata(x,y,z,XI,YI);
contourf(XI,YI,ZI)

As you can see I created the query points and it should function. However, I get this error: Error using scatteredInterpolant The input points must be a double array.

Error in griddata>useScatteredInterp (line 184) F = scatteredInterpolant(inargs{1}(:),inargs{2}(:),inargs{3}(:), ...

Error in griddata (line 125) vq = useScatteredInterp(inputargs, numarg, method, 'none');

It seems matlab wanted me to use scatteredInterpolant rather than griddate so I tried:

if true
  % code
end
F = scatteredInterpolant(lon2,lat2,temp2);
[xx,yy]=meshgrid(lon2,lat2);
zz = F(xx,yy);
contour(xx,yy,zz)
surf(xx,yy,zz)

and I got the error: Error using scatteredInterpolant The input points must be a double array.

if true
  % code
endcontour(lon2,lat2,temp2);

Error using contour (line 53) Z must be at least a 2x2 matrix.

if true
  % code
endmesh(lat2,lon2,temp2);

Error using mesh (line 75) Z must be a matrix, not a scalar or vector.

if true
  % code
end
tri = delaunay(x,y);
  trisurf(tri,x,y,z)

Error using delaunay The input points must be a double array.

It seems that I cannot use a vector for my z values - it must be a matrix? I have not run into this problem before and I don't know how to convert my third column of z values into a geo-referenced matrix. Can anyone help me out?

It may be important to mention that I am using matlab 2016. I have previously used griddata in 2011 with 3 column vectors and I didn't have a problem.