How to plot black line contours on an already plotted contourf plot?

Hello all,

I have two matrices with the same dimensions. I would like to plot the first one as a colored contourf plot. Then, I want to plot the second matrix as, say, black line contoures on the first plot. Using 'hold on' however does not work in this case as the first plot is simply being runned over. How can I do this?

At the moment I use the following for the first contourf plot

figure1 = figure('InvertHardcopy','off','Color',[1 1 1]);
Y = var1;
X = var2;
Z = velocity;
%
L = 100;
x = linspace(min(X),max(X),L);
y = linspace(min(Y),max(Y),L);
[Xi,Yi] = meshgrid(x,y);
Zi = griddata (X,Y,Z1,Xi,Yi);
contourf(Xi,Yi,Zi)

Thanks in advance,

Ron

Answer 1

[darova]

This should be helpfull

[x,y,z] = peaks(20);
contourf(x,y,z,-6:2:6,'linew',2)
hold on
contour(x,y,z,[2 2],'r','linew',3)
hold off

[Ron Nativ]

Thanks darova. This does not solve my problem as in your example the z values are the same, whereas in my code they are not.

[darova]

can you accept my answer?

[Ron Nativ]

I would if it would have worked ....

[darova]

please

[Ron Nativ]

At the moment, the second command (contour) indeed works, but then the first plot looses its filled colors. Why is this?

[darova]

Impossible

[Milligen]

If the z range of the second array is outside the z range of the first array, the color scale will be reset to accommodate the increased range. Since you don't want that, simply rescale the second z array to lie within the range of the first z array.