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Grouping {x,y z} data set


Hi!

I have a question for you.

I have arbitrary data set.

For example,

Data={{x_1,y_1,z_1},{x_2,y_2,z_1},{x_1, y_2, z_3},........{x_n, y_m,
z_L}}

I tried to group this data set depending on z value.

I mean I try to select all x, y values with same z value.

But they are not evenly distributed and they are not integer either.

please help me!

Thanks!



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