credit to Daniel Armyr:

"I think maybe you want to look at this video series. It is a very well-made guide on how to visualize 3d data.

http://blogs.mathworks.com/videos/2009/10/23/basics-volume-visualization-19-defining-scalar-and-vector-fields/

"

>> contour(X,Y,Ex);

and so on.

@Jesus N Eiras it is not working because i have Ex of the order 2810*1 mean one coloumn

then this bit may help:

http://se.mathworks.com/help/matlab/visualize/representing-a-matrix-as-a-surface.html#btdyyta

You have to reshape the array of data you imported in Matlab (if in spreadsheet). For instance if you have a 2D plot with 9 points such as

0 0 v1

1 0 v2

2 0 v3

0 1 v4

1 1 v5

2 1 v6

0 2 v7

1 2 v8

2 2 v9

you can plot by

x=reshape(data(:,1),3,3);

y=reshape(data(:,2),3,3);

z=reshape(data(:,3),3,3);

surf(x,y,z)

Using mathematica you can import exported data on triangular/tetrahedron without pain in the neck and interpolate/plot easily.

@Fabio Garofalo not working

I want to change EX data in the form of "X*Y'(value of Ex on X co-ordinate multiply byvalue of Ex on Y co-ordinate ) like the followings: