Contour on a contourf plot

Hello all,

I would like to plot black contour lines of 'Zi2' matrix on a previously plotted contourd plot (swith the matrix Zi2). The problem is that when I use contour, the colours of the contourf plot are being deleted and only the contours are stayed. Can someone help? here is my code:

[c  h]= contourf(Xi,Yi,Zi,'linew',1)
clabel(c,h) 
hold on;
contour(Xi,Yi,Zi2,'k')

THe plotted figure is attached.

Thanks for your help!

Ron

Answer 1

[KSSV]

contourf gives you a colored plot. It fills the contour lines region with colors. To get whay you want use:

c = contour(Xi,Yi,Zi) ; 

Now check, c has (x,y) coordinates. Now you can plot them using plot with required color.

plot(c(1,:),c(2,:),'k') ; 

Or Striaght away, you can use contour ans specify the color.

contour(Xi,Yi,Zi,'k')

[Ron Nativ]

Thanks for your answer KSSV. When using your solution, I then run into two problems: (1) the x and y axes are changed. When I use xlim and ylim to define them for the relevant limits, then I get wrong contours, see attached figure.

[KSSV]

It should work....did you try contour with black color specififed?

[Ron Nativ]

ok I tracked the problem - I use your command but with 'scatter' instead of 'plot' and there are few point that should not be there and are currently there. I wonder how did they get there. They cause the wrong lines. See attached figure.

[KSSV]

Hey you can use contour with color option..this would be more simpler.

[Ron Nativ]

what do you mean?

[KSSV]

contour(Xi,Yi,Zi,'k')

[Ron Nativ]

Thanks! but this command runs over the filled contour (contourf) and deltes its colors from some reason