Map triplets to a matrix

I have multiple structured meshes of a 2-D mesh that I merged together in pointwise (technically making it unstructured). The data is output into a triplet format:

Variable Names: x y z mach density ...

I am able to map the data run on a structured mesh by reshaping the column vectors into a matrix. I cannot do the same thing with a combination of structured meshes. I can; however, map the mesh in blocks of structured meshes. I import the data from pointwise through a .dat file and get my respective mesh to create the mesh in matlab. The output data is not structured the same way as the pointwise .dat file, so I can't map it directly.

After importing my mesh into matlab, I have a map of each x-y coordinate (z is a constant 0 since it is 2-D). To map each data point onto the mesh, I need to find the matching coordinates and assign the respective information to that point.

Is there a way I can map the data points without using a nested for-loop to search for each coordinate? Unfortunately, I cannot provide sample data.

[KSSV]

Is there a way I can map the data points without using a nested for-loop to search for each coordinate?

Off course there would be...

Unfortunately, I cannot provide sample data.

We cannot help further unless data is provided.

Answer 1

[Thiago Henrique Gomes Lobato]

You can try the ismembertol function:

[XX,YY] = meshgrid(0:0.1:1,0:0.1:1);
Points  = [XX(:),YY(:)];

PointsToMatch = [0,0;
                 0.5,0.3];
tol           = 0.001; % tol for double accuracy
idx = find(ismembertol(Points,PointsToMatch,tol,'ByRows',1));
Points(idx,:)

ans =

                   0                   0
   0.500000000000000   0.300000000000000