How to plot a pcolor from 3 vectors?

I have 3 vectors that I imported from a text file in a three column format that I cannot change. The columns are latitude, longitude and temperature. I want to plot a 2D map with the temperature as a colorbar. Normally I use:

pcolor(lat,lon,temp), shading 'flat';%pcolor/mesh/surf(X,Y,Z)

But this only works when there is a value for every value of lat and lon; Z is a matrix. The values for lat and lon from my new source are scattered and at random intervals. Any suggestions, please?

Cheers,

Alex

Answer 1

[KSSV]

doc griddata

N = 1000 ;
x = 2*rand(N,1) - 1; 
y = 2*rand(N,1) - 1; 
z = 2*rand(N,1) - 1;
v = x.^2 + y.^3 - z.^4;
%
d = -1:0.05:1;
[xq,yq,zq] = meshgrid(d,d,0);
% Interpolate the scattered data on the grid. Plot the results.
vq = griddata(x,y,z,v,xq,yq,zq);
plot3(x,y,v,'ro')
hold on
surf(xq,yq,vq)

[Alex]

Something is the matter with: vq = griddata(x,y,z,v,xq,yq,zq); ??? Error using ==> griddata at 53 XI and YI must be the same size or vectors of different orientations. I am guessing a ' is missing somewhere. For the moment, I am using:

pointsize = 10;
figure, scatter(data(:,1),data(:,2), pointsize, data(:,3))