how to redraw contourf after changing scale

I used contourf. after changing the scales like colorbar min/max/interval, contour line interval etc, how to redraw the contour quickly? I found some contour in previous plot still exist so cause overlapping. Do I have to delete the contourf first? Thanks

Answer 1

[Walter Roberson]

If you are just changing the properties of the contour object returned by contourf() then the graphics will update by themselves the next time the event queue is flushed.

If you already have the handle of a contour object returned by contourf(), and you want to change x, y, z data, and the other properties are going to remain the same, then you can update the XData, YData, or ZData properties of the contour object. The graphic will update by itself the next time the event queue is flushed.

[roudan]

Walter, You saved my evening. Thank you!

[roudan]

Walter, one more question, how to modify the contour's title? I didn't find title property of contour. The contour was plot on subplot. I also tried to set subplot's title using its handle. it didn't work either. it say "No public property title exists for class matlab.graphics.axis.Axes"

Thanks for helping.

[Walter Roberson]

It is case sensitive, Title not title, if you are using dot notation.

ax = gca;
ax.Title

However, Title is a text object, not a string directly.

ax.Title.String = 'new title'

Answer 2

[roudan]

thank you Walter