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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.

KSSV
on 11 Sep 2020

Edited: KSSV
on 12 Sep 2020

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

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