MATLAB: Data picking from grid

grid

I have data in three column (x,y,z)
I want to pick the values of z in each grid …
For exmaple, in fiure, the values of x are plotted coressponding to x,y. Then with a diffrenec of 1 we grided the plot.
I want to calculate the data points placed in each grid.

Best Answer

I have edited the code for your given points so that you can get the points for each grid. 
x = -130.7:0.1:-129.7 ; 
y = 45.6:0.1:46.3 ;
n = length(x) ;
m = length(y) ; 
[X,Y] = meshgrid(x,y) ; 
data = importdata("data.txt") ; 
x = data(:,1) ; y = data(:,2) ; z = data(:,3) ;
% plot grid 
plot(X,Y,'r',X',Y','r')
hold on 
for i = 1:m-1
  for j = 1:n-1
    % Get the points of each grid 
    P = [X(i,j) Y(i,j) ; 
         X(i,j+1) Y(i,j+1) ; 
         X(i+1,j+1) Y(i+1,j+1) ;
         X(i+1,j) Y(i+1,j)] ; 
         
    idx = inpolygon(x,y,P(:,1),P(:,2)) ; 
    iwant = [x(idx) y(idx) z(idx)] ; 
    plot(x(idx),y(idx),'.')
    drawnow
   end
end
Related Question