MATLAB: Draw solid line around area in contourf

Question

Hi!

I wonder how I can plot a solid line around areas when using contourf? I use

figure
contour(t,frequency,power,20); 
set(gca,'YLim',[5 15]); 
colormap(autumn);

to plot power versus frequency and time. In many cases I have nans so the plot has white areas as well. So, I wonder how I can plot a solid line separating the colorful areas from the white (nan) areas? It would kind of be drawing a line around areas in the figure. The power at the border between the white and the areas isn't necessarily the same everywhere (so I can't plot a line when the power equals a certain value).

Thanks!

Emma

Answer 1

Perhaps something like

hold on
contour(t, frequency, 0 + isnan(power), [1 1])
hold off