Create a generic matrix array (coordinates ) based on input data in a specific direction as attached in the photo
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Hi guys,
I am a bit new to matlab, tyring to generate generic matrix array coordinates (x,y).. I have tried the following code, but works in the wrong direction,
So can anyone help me .... with modifying the code, or so..
thank you, ![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/660160/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/660160/image.jpeg)
clear all;
clc;
w=1; b=1; m=2; n=2;
dx = w/m; dy = b/n;
tnod = (n+1)*(m+1); % total number of nodes
co = zeros(tnod,3);
for ii = 1:m+1
for jj = 1:n+1
node = jj + (ii-1)*(n+1);
x(ii,jj) = (ii-1)*dx;
y(ii,jj) = (jj-1)*dy;
co(node,1) = x(ii,jj);
co(node,2) = y(ii,jj); % CO not as I want
end
end
% CO result should be the following:
0 0 0
0.5 0 0
1 0 0
1 0.5 0
1 1 0
0.5 1 0
0 1 0
0 0.5 0
0.5 0.5 0
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Accepted Answer
Jonas
on 22 Jun 2021
Edited: Jonas
on 22 Jun 2021
here a quite manual solution, there may be something easier
width=2.8;
height=1.5;
pointsAlongY=4;
pointsAlongX=4;
dx = width/(pointsAlongX-1);
dy = height/(pointsAlongY-1);
tnod = (pointsAlongX)*(pointsAlongY);
numberedGrid = zeros(pointsAlongY,pointsAlongX);
co=zeros(tnod,2);
currGridCoord=[1 pointsAlongY]; % x and y coordinate in grid
currRealCoord=[0 0];
currNode=1;
while 1
numberedGrid(currGridCoord(2),currGridCoord(1))=currNode;
co(currNode,:)=currRealCoord;
currNode=currNode+1;
% look if we are at the edges of the matrix or if the next entry is
% unequal 0
% we want to move right first, then up, left and down
rightCondition=currGridCoord(1)~=pointsAlongX && numberedGrid(currGridCoord(2),currGridCoord(1)+1)==0;
upCondition=currGridCoord(2)~=1 && numberedGrid(currGridCoord(2)-1,currGridCoord(1))==0;
leftCondition=currGridCoord(1)~=1 && numberedGrid(currGridCoord(2),currGridCoord(1)-1)==0;
downCondition=currGridCoord(2)~=pointsAlongY && numberedGrid(currGridCoord(2)+1,currGridCoord(1))==0;
if rightCondition && ~downCondition
currGridCoord(1)=currGridCoord(1)+1;
currRealCoord(1)=currRealCoord(1)+dx;
elseif upCondition
currGridCoord(2)=currGridCoord(2)-1;
currRealCoord(2)=currRealCoord(2)+dy;
elseif leftCondition
currGridCoord(1)=currGridCoord(1)-1;
currRealCoord(1)=currRealCoord(1)-dx;
elseif downCondition
currGridCoord(2)=currGridCoord(2)+1;
currRealCoord(2)=currRealCoord(2)-dy;
else
break;
end
end
% there you can see how we went through the matrix
numberedGrid
% list of coordinates
co
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