Making matrix from coordinates

I have 460 x and y coordinates. How do I make a matrix ? Thanks in advance.

Answer 1

[Ameer Hamza]

See meshgrid()

x; % vector of x-values
y; % vector of y-values
[X, Y] = meshgrid(x, y)

[Ishani Mukherjee]

Thanks for the prompt reply!

This makes 2 separate matrices.. Is there any way I can make a single matrix that has both x and y coordinates? Each value in the matrix would have a x coordinate and a y coordinate.

[Ameer Hamza]

You can create a 3D matrix or a cell aray.

3D matrix:

x = [1,2,3];
y = [2,3,4];

[X, Y] = meshgrid(x, y);
XY = cat(3, X, Y);

Access values like this

>> XY(1,1,:)
ans(:,:,1) =
     1
ans(:,:,2) =
     2

However this will return a 3D vector with two elements. To get a normal 2D vector

>> squeeze(XY(1,1,:))
ans =
     1
     2

Cell array:

x = [1,2,3];
y = [2,3,4];

[X, Y] = meshgrid(x, y);
XY = arrayfun(@(x, y) {[x y]}, X, Y);

and access elements like this

>> XY{1,1}
ans =
     1     2

[Ishani Mukherjee]

Thank you so much. Is there any way I can plot the matrix?

[Ameer Hamza]

Something like this

x = [1,2,3];
y = [2,3,4];
[X, Y] = meshgrid(x, y);
plot(X(:), Y(:), '+')

[Ishani Mukherjee]

Thanks!!