How to count points inside each grid cell with central value of each grid cell?

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Andi 2022-6-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1732345-how-to-count-points-inside-each-grid-cell-with-central-value-of-each-grid-cell

评论： Walter Roberson 2022-6-2

Hi everyone,

I have created a mashgrid to plot my data points with each small bins (figure attached). Now, I need to count data points within each bin along with the cental value of each grid cell.

Here is my attempt:

x = -130.05:0.01:-129.95; 
y = 45.90:0.01:46.00; 
n = length(x ) ;
m = length(y ) ;
[X,Y] = meshgrid(x,y ) ;
x = axil_long ; y = axil_lat ; z = time_axil(:,1) ;
plot(X,Y,'r',X',Y','r ')
hold on
for i = 1:m-1
for j = 1:n-1
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 = [ z(idx )] ;
plot(x(idx),y(idx ),'.')
zStore{i,j} = z(idx);
end
end