MATLAB: Contour lines over contourf 2D matrix

2dcontourcontourflinesmatrix

I would like to plot thick lines where y = n as a contour line on top of a contourf plot (like the image attached). How can I do this?

I have 3 Matrices I use to contourf: xi,yi,zi – all same dimensions (200×100). I want to use zi data to create the superimposed contours. I do not wish to set the levels within contourf as this is not useful for what I wish to do. I would like to control the contours completely seperate.

For an extra bonus point, it will be nice to have corresponding labels.

Best Answer

Use the hold function, and plot only the lines of interest using a second call to the contour (not contourf) function.

See the contour documentation for Display Single Contour Line for details.

Related Solutions

MATLAB: How to label contour lines in meshc 3D-plot

I would use a separate call to contour. You may have to experiment with the approach in Yair Altman’s Undocumented MATLAB article Customizing contour plots part 2 to put the contour plot on the same plane as the contours drawn by the meshc function.

When you get your code working, consider generalising your code to a function and then contribute it to the File Exchange. It seems useful.

MATLAB: Contour on a contourf plot

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')

Best Answer

Related Solutions

MATLAB: How to label contour lines in meshc 3D-plot

MATLAB: Contour on a contourf plot

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