Contour plot with NaN value ?

Hi I have large ocean depth matrix with lots of NaN value. Please see the attached image. When I try to make a contour plot, I get a blank contour plot ? How Do I show my depth in the contour plot with the NaN value ? Thanks

Answer 1

[Walter Roberson]

If the NaNs represent missing data that should be assumed to vary smoothly with the surrounding data, then you would use the known data to do interpolation. Look in the file exchange for inpaint_nans .

If the NaNs represent "data at this location is invalid and should not be considered" (for example, land that is above water), then there is not a lot you can do with contouring. In that situation, perhaps you would

contour( kron(YourMatrix, ones(2,2)) )

the kron turns every location into a 2 x 2 block to give contour a chance to draw something -- but that does mess up your coordinate system.