converting 2D XY coordinated into Grid format

Hello ,

I have nearly 485719 XY coordinates and i would like to transfer this XY plotting over the grid format.

could you please do help me out.

I have already looked many examples but it does not help me out.

thank you

Answer 1

[KSSV]

It depends whether your data is gridded or scattered. Follow the below code to get what you want. Let A be your m*2 array.

x = A(:,1) ; y = A(:,2) ; 
%%structured 
xi = unique(x) ; yi = unique(y) ;
[X,Y] = meshgrid(xi,yi) ;
figure
plot(X,Y,'.r')
%%unstructured 
dt = delaunayTriangulation(x,y) ;
tri = dt.ConnectivityList ;
figure
trimesh(tri,x,y)

[SatyaPrakash Gupta]

I get an error as below attached.

[KSSV]

It looks like your data is scattered......attach your data. Read about griddata. Did you try the second option?

[SatyaPrakash Gupta]

Yes but it does not help and also yes my data are scattered.

i have nearly 16533859 xy coordinates which make the system very very slow.

when i try to zoom the figure , it takes around 1 minute to click one time zoom, who can i increase the speed.

also request you to kindly do share me the link where i can understand the griddata

[KSSV]

YOu should use delaunay triangulation......it should be fast enough.

https://in.mathworks.com/help/matlab/ref/griddata.html

[SatyaPrakash Gupta]

Hi

delaunary does not allow me to execute because i have huge set of datas

I see all the data to be appeared in 3D but i am only intrested in 2D.

is it possible to grid only over the xy coordinates instead doing in full figure ? if so then how shall i do it ?

Please note : as i mentioned i have a huge data approx :26598326

[KSSV]

delaunary does not allow me to execute because i have huge set of datas

did you a try?

I see all the data to be appeared in 3D but i am only intrested in 2D.

Did you check the code, which I gave it is using 2D.

is it possible to grid only over the xy coordinates instead doing in full figure ? if so then how shall i do it ?

Read about griddata.

[SatyaPrakash Gupta]

Yes i have tried all the method you have mentioned and delaunary works but takes lot of time

it take lot of time to plot data , how can i extract data or find data(i.e xy coordinates) from each grid ?

[KSSV]

Attach your data.

[SatyaPrakash Gupta]

can you please do share me the link where i can share my data

[KSSV]

You can aatach here.

[SatyaPrakash Gupta]

It is approx 8mb and it is not allowing me, thats why i have asked for the shared link

[KSSV]

google drive.