how to find coordinates of a point at where 4 grids meets each other

a region is divided into 4 grids code is needed to find the coordinates of point at where grids met

Answer 1

[KSSV]

You have to give lot of information on this... How the grid data is? How the grids are? Do you have each grid separately? If you have each grid data separately, then you can use intersection of the data to get the common data.

[kiranpreet kaur]

actually sir grids are seperated i have to find its corner points and from that points further i want to calculate minimum distant nodes in a network

[KSSV]

How the data is?

[kiranpreet kaur]

actually i am work on wsn and i have to cache data on the node which is present near to the corner of grid.........so for that i have to find the coordinates ie corners of each grid and then by using that coordinates i found minimum distance

[kiranpreet kaur]

close all; clc; ngrid=4; N=50; R=0.2; sink.x=3.1; sink.y=3.1; x = linspace(0, 4, ngrid+1); E=0.5; [X,Y] = meshgrid(x); figure(1) plot(X,Y,'k') hold on plot(Y,X,'k') hold on ngrid = 4; coords = rand(N,2) * ngrid; nodes = struct('x',coords(:,1),... %# Assign x coordinates 'y',coords(:,2),... %# Assign y coordinates 'energy',E);

scatter(coords(:,1),coords(:,2)); set(gca, 'XTick', 1:ngrid+1, 'YTick', 1:ngrid+1) axis square plot(nodes.x,nodes.y,'o','LineWidth',2, 'MarkerEdgeColor','b','MarkerFaceColor','b','MarkerSize',3) plot(sink.x,sink.y,'d','LineWidth',2, 'MarkerEdgeColor','r','MarkerFaceColor','y','MarkerSize',12)

[KSSV]

You better attach the .m file....

Answer 2

[KSSV]

This is the image I got...You want to find the black circles plotted on the image? If so, they already available in [X,Y].

If not, point what intersection point you want in the figure.

[kiranpreet kaur]

can u plz help me with some code

[KSSV]

Yes please.....!

Answer 3

[KSSV]

close all;
clc;
ngrid=4;%no. of grids
N=200;
R=0.5;
sink.x=3.1;
sink.y=3.1;
x = linspace(0, 4, ngrid+1);
E=0.5;
[X,Y] = meshgrid(x);
figure(1)
plot(X,Y,'k')
hold on
plot(Y,X,'k')
hold on
ngrid = 4;
coords = rand(N,2) * ngrid;
nodes = struct('x',coords(:,1),...   %# Assign x coordinates
               'y',coords(:,2),...   %# Assign y coordinates
               'energy',E);

scatter(coords(:,1),coords(:,2));
set(gca, 'XTick', 1:ngrid+1, 'YTick', 1:ngrid+1)
axis square
plot(nodes.x,nodes.y,'o','LineWidth',2,   'MarkerEdgeColor','m','MarkerFaceColor','m','MarkerSize',3)
plot(sink.x,sink.y,'d','LineWidth',2,   'MarkerEdgeColor','r','MarkerFaceColor','y','MarkerSize',12)
grid on;
%%Get nodes inside for each box 
P1 = cell(4,4) ;
for i = 1:4
    for j = 1:4
        A = [X(i,j) Y(i,j)] ;
        B = [X(i+1,j+1) Y(i+1,j+1)] ;
        idx = find(nodes.x >= A(1) & nodes.x <B(1)) ;
        idy = find(nodes.y >= A(2) & nodes.y <B(2)) ;
        id = intersect(idx,idy) ;
        P1{i,j} = [nodes.x(id) nodes.y(id)] ;
        % plot points inside first box 
        plot(P1{i,j}(:,1),P1{i,j}(:,2),'*g')
    end
end