How can I save values in a 2d matrix corresponding to coordinates?

I have a set of values that correspond to certain coordinates on a grid. How can I create a matrix that stores these values in the corresponding location, with blank values for all other points on the matrix?

For example, if I had

values = [1, 5, 22, 13, 8] x = [2, 4, 3, 3, 1] Y = [1, 5, 4, 3, 5]

Where a value of 1 is at coordinates (2,1), value of 5 is at (4,5), etc.

So the result would be something like

 0     1     0     0     0

 0     0     0     0     0

 0     0     13    0     0

 0     0     22    0     0

 8     0     0     5     0

Answer 1

[Andrei Bobrov]

accumarray([y(:),x(:)],values(:))

[Bob]

Sorry, I oversimplified my example. The X and Y coordinates contain some decimal values.

 accumarray([Y(:),X(:)],values(:));

gives me the error

 Error using accumarray
 First input SUBS must contain positive integer subscripts.

I tried switching from kilometers to meters to get rid of the decimals, but got an out of memory error doing that.

[Star Strider]

To get rid of the decimals, use the ceil function.

[Bob]

Thanks for your response. I think I may just need to repost with a more complex description of the problem. I actually will need those decimals to perform further calculations after the values are stored in the matrix, so I can't round them off.