Setting and storing vertex locations in a shader

this question is a follow up from http://answers.unity3d.com/questions/543558/moving-vertices-in-shaders.html#

Hi there,

I have am able to move a single vertex to my desired position, but on 1 plane, i have 100 vertices, and once they have been moved, I would like them stored there.

My initial thought is to make a multidimensional float array like this:

 uniform float2 coords[10][10]; //this already gives an error

 

And then just iterate through them using 2 for loops. So they are saved in the shader and will not reset the next call

But i can't seem to get a 2D array in my shader without getting "syntax error". Is there a way to achieve this so that my final vert function will look a bit like:

         void vert(inout appdata_full v)
         {
             float4 castToWorld = round(mul(_Object2World, v.vertex) );
             v.vertex.y = coord[castToWorld.x][castToWorld.z];
         }

This might be a stretch, but it would be so awesome if it was possible. I guess the main question is, how do I declare a 2D array in the shader? Any help or alternative methods are much appreciated :)