contour diagram with three vectors

I need to make a contour diagram. And it consist of three vectors with x-coordiantes, y-coordinates and then the related stresses to each point.

For example:

1....Nodal_coordinate_x....nodal_coordinate_y.....stress_value

2..........0..................................10.......................150

3..........1..................................10 ......................200

4..........1..................................0........................100

Do you know how I can do this? So it could end up looking like this: where I have plottet all the coordinates and then related the stresses to each point showing the contour colours where the stresses are small/larger?

Answer 1

[Aquatris]

Here is one way:

x = linspace(0,4,10); % x coordinate
y = linspace(0,8,10); %^y coordinate

[X,Y] = meshgrid(x,y); % meshgrid

Z = sin(X)+cos(Y); % Z data, the stresses for X-Y coordinates

c = Z(:); % colors for scatter plot, make it a vector since scatter plot expect vectors

% actual plot
scatter(X(:),Y(:),[],c )
axis([-1 5 -1 9])

Here is another using actual contour plot:

contourf(X,Y,Z)